Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Smelser, D. P. and Lauchheimer, Malcom H. and Fox, Early Lee and Hunting, Warren Belnap","Unemployment and American trade unions . The labor law of Maryland . The American Colonization Society, 1817-1840 . The obligation of contracts clause of the United States Constitution",,Johns Hopkins University Press,1919,The Johns Hopkins University studies in historical and political science,,,,https://cir.nii.ac.jp/crid/1130000798231520128