Patton, F. Lester Diminishing returns in agriculture / F. Lester Patton - 1st. AMS ed. - New York : AMS Press , 1968 - 100p. : ill. ; 22 cm. - Columbia University studies in the social sciences . Includes bibliographical references and index. Subjects--Topical Terms: Agricultural economicsEconomic aspectsAgricultureDiminishing returns Dewey Class. No.: 630 / PAT