The fertility of the forest
Paul Zinke, Forestry
Alan Stangenberger, Department of Forestry and Conservation
Wilmer Colwell, California Soil-Vegetation Survey
California Agriculture 33(5):10-11. DOI: 10.3733/ca.v033n05p10.
Paul J. Zinke, Professor, Forestry, U.C. Alan Stangenberger, Assistant Programmer, Department of Forestry and Conservation, U.C. Wilmer Colwell, Retired Director, California Soil-Vegetation Survey.