Text ( visual ) : unmediated Coping with ghetto unemployment / John F. Kain. -- Cambridge, Mass. : Harvard university , 1969. -- 18 p. ; 29 cm. -- (Discussion paper ; no. 40). -- "Program on regional and urban economics" ; "Project number OER-015-G-68-7.". -- (BA28135495) ; https://ci.nii.ac.jp/ncid/BA28135495 Author Heading(s): Kain, John Forrest