00698cam a22002411 4500 agr50000411 DLC 20260227111013.0 770519s1950 xx 000 0 eng c agr50000411 GB50-2686 (OCoLC)2978950 U. S. Dept. of Agr. Libr. ODa Uk DLC premarc S495 .R68 630.973 Roberts, Roy W 1898- Modern farming [by] Roy W. Roberts [and others] Philadelphia, Lippincott [c1950] viii, 600 p. illus., maps. 22 cm. "References" at end of each chapter. Agriculture United States. 11163 11163