论文信息 - Founding the USDA's Division of Agricultural Soils: Charles Dabney, Milton Whitney, and the State Experiment Stations - 字舞流文

Founding the USDA's Division of Agricultural Soils: Charles Dabney, Milton Whitney, and the State Experiment Stations

A. Effland | D. Helms | Steven Phillips

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[2] D. H. Yaalon,et al. E.W. Hilgard and John Wesley Powell: efforts for a joint agricultural and geological survey , 1995 .