BOOKQUE

The Fertilization of Potatoes in Peru: A summary and interpretation of data from field experiments completed from 1959 through 1964 in the Sierra. I
Bobby H. Robinson , D. Morris Porter , David L. Terry , Durham Keith Bell , J. D. Dolman , Kate Baucom Garner , ROBERT EDMUND MCCOLLUM , Roy A. Larson , Walter Elmer Ballinger
· 1967
Fertilización del cultivo de la papa en el Peru
Robert Edmund McCollum
· 1967
No image available
Potassium-nitrogen Interactions in Corn and the Influence of Potassium on Pyruvic Kinase from Plant Tissues
Robert Edmund McCollum
· 1957
No image available
The Fertilization of Potatoes in Peru: A summary and interpretation of data from field experiments completed from 1959 through 1964 in the Sierra. I
Robert Edmund McCollum , Carlos Valverde S.
· 1968
No image available
An Estimate of the Bias Involved in Summarizing Soil Test Results from Voluntary Farmer Samples and the Influence of Soil Series and Management on Chemical Analyses
Robert Edmund McCollum
· 1953
No image available
A Study of the Mental Capacity of the Negro
Robert Edmund McCollum
· 1926