Berry, A.. Unemployment as a social problem in urban Colombia : some preliminary hypotheses and interpretations / A. Berry - [New Haven : Economic Growth Center, Yale University , 1972 - iv, 99 leaves ; 28 cm. - Center discussion paper ; no. 145 . Includes bibliographical references. Subjects--Topical Terms: Unemployment--ColombiaLabor supply--Colombia Dewey Class. No.: 301.5 Co / BER