Text ( visual ) : unmediated Research in rural population : scope and method / prepared under the direction of the Advisory Committee on Social and Economic Research in Agriculture ; [edited by] John D. Black ; [exective secretary ...] Bruce L. Melvin. -- New York : Social Science Research Council , 1932. -- 149 p. ; 23 cm. -- (Bulletin / Social Science Research Council (U.S.) ; no. 4). -- Bibliography: p. 148-149. -- (BA5515292X) ; https://ci.nii.ac.jp/ncid/BA5515292X Author Heading(s): Social Science Research Council (U.S.) ; Black, John D. (John Donald) ; Melvin, Bruce Lee