Yearbook of Agriculture
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H. W. Schoening Benjamin Schwartz *~, c t\- c C ir -<.;- Causes of D1sease 29
E. F. Knipling Aubrey M. Lee H. W. Schoening Benjamin Schwartz How Diseases
and Parasites Are Spread 40 Arthur W. Lindquist Nelson F. Waters Genetics and
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