The Minerals Management Service (MMS) developed a comprehensive strategy for postlease National Environmental Policy Act (NEPA) compliance for development and production projects in deepwater areas (water depths greater than 400 m (1,312 ft) in the Central Planning Area (CPA) and Western Planning Area (WPA) of the Gulf of Mexico (GOM). The strategy led to the development of a biologically-based grid system to ensure broad and systematic analysis of the GOM's deepwater region, which is explained on MMS's website. This strategy divides the deepwater Gulf into 17 areas or "grids" of biological similarity that generally correlate to water depth.

More than two decades of study have established the major features of lunar geologic style and history. The most numerous and significant landforms belong to a size-morphology series of simple craters, complex craters, and ringed basins that were formed by impacts. Each crater and basin is the source of primary ejecta and secondary craters that, collectively, cover the entire terra. The largest impacts thinned, weakened, and redistributed feldspathic terracrustal material averaging about 75 km in thickness. Relatively small volumes of basalt, generated by partial remelting of mantle material, were erupted through the thin subbasin and subcrater crust to form the maria that cover 16 percent of the lunar surface. Tectonism has modified the various stratigraphic deposits relatively little; most structures are confined to basins and large craters. This general geologic style, basically simple though complex in detail, has persisted longer than 4 aeons (1 aeon = 109 yr). Impacts began to leave a visible record about 4.2 aeons ago, after the crust and mantle had differentiated and the crust had solidified. At least 30 basins and 100 times that many craters larger than 30 km in diameter were formed before a massive impact created the Nectaris basin about 3.92 aeons ago. Impacts continued during the ensuing Nectarian Period at a lesser rate, whereas volcanism left more traces than during pre-Nectarian time. The latest basin-forming impacts created the giant and still-conspicuous Imbrium and Orientale basins during the Early Imbrian Epoch, between 3.85 and 3.80 aeons ago. The rate of crater-forming impacts continued to decline during the Imbrian Period. Beginning in the Late Imbrian Epoch, mare-basalt flows remained exposed because they were no longer obscured by many large impacts. The Eratosthenian Period (3.2-1.1 aeons ago) and the Copernican Period (1.1 aeons ago to present) were times of lesser volcanism and a still lower, probably constant impact rate. Copernican impacts created craters whose surfaces have remained brighter and topographically crisper than those of the more ancient lunar features.

Discusses alternative administrative actions to protect and manage the natural resources on 5.7 million acres of federal lands in the Iliamna area of Alaska.

The Moon held little interest for most scientists after its basic astronomic properties had been determined and before direct exploration appeared likely. Speculations about its internal structure, composition, and origin were only broadly constrained by cosmochemical data from meteorites and solar spectra, and by astronomic data about its size, shape, motions, and surficial properties. Most investigators who were active before the space age began in 1957 believed that significant new advances in lunar knowledge required acquisition of additional data. One analytical technique, however, was insufficiently exploited before the 1960's. Few scientists since the geologist Gilbert had studied the lunar surface systematically from the historical point of view. Those who did immediately obtained important new insights about the Moon's postaccretion evolution. Then, the pioneering work of E.M. Shoemaker and R.J. Hackman focused the powerful methods of stratigraphy on lunar problems. Stratigraphy is the study of the spatial distribution, chronologic relations, and formative processes of layered rocks. Its application to the Moon came relatively late and met resistance, but the fundamental stratigraphic approach was, in fact, readily transferable to the partly familiar, partly exotic deposits visible on the lunar surface. Stratigraphic methods were applied systematically during the 1960's in a program of geologic mapping that aimed at reconstructing the evolution of the Moon's nearside. Order was discovered among the seemingly diverse and random landforms of the lunar surface by determining the sequence in which they were emplaced. The stratigraphic sequence and the emplacement processes deduced therefrom provided a framework for exploration by the Apollo program and for the task of analyzing the returned samples. During the 19703, the sophisticated labor of hundreds of analysts was brought to bear on the wealth of material returned by the American Apollo and the Soviet Luna spacecraft. Our present perception of the Moon has emerged from the interplay between sampling studies and stratigraphically based photogeology. These two approaches are complementary: Photogeology contributes a historical context by viewing the whole Moon from a distant vantage point, whereas the samples contain information on rock types and absolute ages unobtainable by remote methods. Neither approach by itself, even the most elaborate program of direct surface exploration, could have yielded the current advanced state of knowledge within the relatively short time of two decades. This volume presents a model for the geologic evolution of the Moon that has emerged mainly from this integration of photogeologic stratigraphy and sample analysis. Other aspects of the vast field of lunar science are discussed here only insofar as they pertain to the evolution of visible surface features. Chemical data obtained by remote sensing supplement the photogeologic interpretations of some geologic units, and geophysical data obtained both from lunar orbit and on the surface constrain hypotheses of the origin of many internally generated structures and deposits. Studies of the same data that treat the Moon as a whole, including speculations about the intriguing but unsolved problem of its origin, have been adequately covered in other reviews. This volume is written primarily for geoscientists and other planetologists who have examined some aspect of lunar or planetary science and who want a review of lunar science from the viewpoint of historical geology. It should also provide a useful summary for the advanced student who is conversant with common geologic terms. It may, furthermore, interest the geologist who has not studied the Moon but who wishes to see how his methodology has been applied to another planet.

This manual contains the engineering tools and concepts that have proven useful in planning, constructing, and maintaining drainage systems for successful long-term irrigation projects. The manual is not a textbook. Mathematical and experimental development of the engineering tools has generally not been included. Indeed, not even all the innovative ways to use the tools are included. The manual provides drainage engineers a ready reference and guide for making accurate estimates of drainage requirements. Design and construction criteria, if followed with reason, will result in reliable drainage systems for irrigated areas. All the methods and techniques covered in the manual have proven to be very satisfactory through observed field conditions on irrigated lands throughout the world. Some methods have a more elegant development and basis in science than others, but all have been designed to solve practical problems in the field.

The National Park Service, a branch of the Department of the Interior, knows preservation. In its hundred-year existence, the service has dealt with just about every problem an old structure can have. Whether it is removing graffiti in Manhattan or rebuilding a barn in Oregon, the National Park Service knows what to do. Here are the official U.S. guidelines, a lively and instructive collection of tried and tested knowledge and reliable techniques, written by the top experts in the field. Over forty fully illustrated chapters addressing topics such as: — cleaning and waterproof coating of historic masonry — roofing for historic buildings — the preservation of historic glazed architectural terra-cotta — exterior paint problems on historic woodwork — the preservation of historic barns — heating, ventilating, and cooling historic buildings — historic signs — applied decoration for historic interiors — using substitute materials on historic building exteriors — understanding old buildings — understanding architectural cast iron Every chapter is written with the utmost detail and clarity so that any reader can perform the safest and most historically accurate repairs. The book also offers invaluable advice on what not to do that can save a homeowner thousands of dollars, hours, and perhaps a priceless piece of architecture. For the hobbyist or the professional restorer, The Preservation of Historic Architecture is the definitive government text on restoring, repairing, and preserving old buildings.

The new climate policy of the United States was introduced when President Donald Trump signed an Executive order on "Promoting Energy Independence and Economic Growth" on March 28th 2017. This Order completely annulets climate policy of the former President Barack Obama. Get a direct insight in a complete climate policy and plans of Barack Obama, together with the changes made by the new President. This collection will display the straightforward impartial information through the concrete government documents and legislation. Contents: Barack Obama's Climate Policies: Climate and Energy Accomplishment Barack Obama's Climate Action Plan Discretionary Programmatic Environmental Impact Statement to Modernize the Federal Coal Program Executive Orders: Preparing the United States for the Impacts of Climate Change Planning for Federal Sustainability in the Next Decade Presidential Memorandum: Climate Change and National Security Paris Agreement Donald Trump's Climate Policies: Executive Order: Promoting Energy Independence and Economic Growth Remarks by President Trump at Signing of Executive Order to Create Energy Independence