D. Helms

发表

Readings in the history of the Soil Conservation Service

D. Helms, 1992 .

Soil surveys and maps.

R. J. McCracken, D. Helms, P. McDonald, 1994 .

Soil and Southern History

D. Helms, 2000, Agricultural History.

The Distribution of Fusarium Wilt of Blackeyed Cowpeas within California Caused by Fusarium oxysporum f. sp. tracheiphilum Race 4.

S. Temple, D. Helms, S. Smith, 1999, Plant disease.

"Quite a Wrestling Match": The Adaptation of Dryland Farmers to Irrigation

D. Helms, B. Cannon, D. Bowers, 1994 .

Hugh Hammond Bennett and the creation of the Soil Erosion Service

Douglas Helms, D. Helms, 2009, Journal of Soil and Water Conservation.

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

A. Effland, D. Helms, Steven Phillips, 2008 .

The Early Soil Survey: Engine for the Soil Conservation Movement

D. Helms, 2001 .

Early Leaders of the Soil Survey

D. Helms, 2008 .

Contributions of African‐Americans and the 1890 Land‐Grant Universities to Soil Science and the Soil Survey

M. D. Mays, D. Helms, Horace C. Smith, 2008 .