Presents estimates of the amount of productive forest land displaced at five levels of recreation development in three National Forests in California. Includes expansion possibilities for different components of the recreation complexes. The cash investment needed for recreation facilities, relative to the cost in terms of foregone opportunities for timber production, is explored.

Gebruikershandleiding voor een reeks computerprogramma's om kaarten en luchtfoto's voor bosbouwkundige doeleinden in een computer op te slaan. Kennis van de computertaal FORTRAN is vereist

Includes its Reports.

A two-stage shelterwood cutting, at 12 trees per acre, with site preparation, enhanced seedfall, regeneration, and residual growth at the Challenge Experimental Forest, north central California. Shelterwood trees produced 9.2 times more seed than trees in the control. Ponderosa pine regeneration numbered about 3700 seedlings per acre (9139 per ha) and tolerant conifers 600 seedlings (1482 per ha) after 5 years. Hardwood seedlings and sprouts also were abundant. Basal area growth rates for all species in nearly all diameter classes were greater in the shelterwood than in the control. The shelterwood cutting method is recommended for use in young-growth, mixed-conifer stands.

Ohia forest decline-its severity and rate of spread-was studied by aerial photographic techniques on a 197,000-acre (80,000-ha) portion of the island of Hawaii. In 1954, only 300 acres (121 ha) showed signs of severe decline; by 1972, the acreage of severely affected forest had increased to 85,200 acres (34,480 ha). Rate of decline and current severity were related to mean annual precipitation and to elevation. The epidemic is continuing. Some forests on other Hawaiian islands also display decline symptoms.