By Carver, Thomas Nixon, 1865-1961 . Genre Agriculture / Economic aspects / United States / United States / Agriculture . Names life / soil / wheat / animals / horse and 1346 more

By Witmer, Lightner, 1867-1956 . Genre Educational psychology / Psychophysiology . Names eye / retina / called / simple / xx and 824 more

By Hopkins, Cyril George, 1866-1919 / Pettit, James Harvey, 1876-1914 . Genre Soil science / Laboratory manuals / Soil fertility . Names soil / ammonia / xx / phosphorus / beaker and 236 more

By Sanderson, Dwight, 1878-1944 / Jackson, C. F. (Cicero Floyd), b. 1882 . Genre Entomology . Names insects / thorax / adult / beetle / called and 3418 more

By Moore, Veranus A. (Veranus Alva), 1859-1931 . Genre Bacteriology / Laboratory manuals . Names bacteria / bacillus / micrococcus / animal / anthrax and 1231 more

By Morgan, Conway Lloyd, 1852-1936 . Genre Biology / Animal intelligence / Psychology, Comparative / Evolution . Names life / animal / animals / insects / called and 3238 more

By Hough, Theodore, 1865-1924 / Sedgwick, W. T. (William Thompson), 1855-1921 . Genre Physiology / Hygiene / Sanitation . Names life / bacteria / called / animal / order and 1640 more

By Bergen, Joseph Y. (Joseph Young), 1851-1917 . Genre Botany / United States / Botany / Text-books . Names leaves / plants / flowers / flower / fruit and 3720 more

By Duggar, Benjamin M. (Benjamin Minge), 1872-1956 . Genre Fungal diseases of plants .

By Roth, Filibert, 1858-1925 . Genre Forests and forestry .