The Social Studies Classroom as a Research Laboratory - Ross, P. J. 〈Jr〉 (Periodicals Archive Online (PAO), 1939)
http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:3111-1939-030-04-000008
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