/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Koos%2C%20Leonard%20Vincent%2C%22&sort_by=relevance&format=rss 2 0 50 ISBN: /cgi-bin/koha/opac-detail.pl?biblionumber=20313 By Koos, Leonard Vincent,.
Washington : Govt. Print. Off., 1919 .
63 p. ; 23 cm..

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]]> /cgi-bin/koha/opac-detail.pl?biblionumber=20313 ISBN: /cgi-bin/koha/opac-detail.pl?biblionumber=21307 By Pierce, Anne E..
Washington, D. C. : U.S. Govt. print. off., 1933 .
vii, 68 p. : , At head of title: United States Department of the interior. Ray Lyman Wilbur, secretary. Office of education, William John Cooper, commissioner. | National survey of secondary education. Monograph no. 25. | William John Cooper, director; Leonard V. Koos, assistant director; Carl A. Jessen coördinator. 24 cm..

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