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roy w simonson
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Letters, Letter Segments, and Memoirs from a Farm
Roy W. Simonson · Infinity Pub
229 sayfa · 2005
Farm life / Social life and customs / Farmers / Biography / Norwegian Americans
Non-agricultural applications of soil surveys
Roy W. Simonson · Elsevier Scientific Publishing Co.
178 sayfa · 1974
Soil surveys / Soil mechanics / Land use / Soil science
Historical highlights of soil survey and soil classification with emphasis on the United States, 1899-1970
Roy W. Simonson · International Soil Reference and Information Centre
83 sayfa · 1989
History / Soil surveys / Soils / Classification