Classification. Class H: Social sciences. - U. S. Library of Congress Classification Division; Martel, Charles 1860-1945.; Churchill, G. M. (George Morton) 1874-1950.; Perley, Clarence W. (Clarence Warner) 1867-1946. (Washington U. S. Government Printing Office, 1920)
At head of title : Library of Congress
First edition, 1910, by Charles Martel, chief classifier. The present edition has been prepared by George M. Churchill, classifier, under supervision of Clarence W. Perley, chief of the Classification division.
Keywords: Classification -- Books -- Social sciences