American soil scientists

American scientist, biochemist, microbiologist who discovered Streptomycin and many antibiotics

American microbiologist (1920-2005)

American engineer (1874–1963)

American physicist (1867–1940)

American paleontologist and geologist (1841–1906)

German-American geologist (1833-1916)

United States hydrologist, soil scientist (1875-1945)

American agronomist

Cuban-American soil scientist