Jahn, George H.2016-10-312016-10-3119471947b14694591(OCoLC)07834845(OCoLC)ocm07834845https://hdl.handle.net/2144/18808Thesis (Ed.M.)--Boston University, 1947. This item was digitized by the Internet Archive.en-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictionsThe effect of a year of high-school biology on achievement in first-semester college biologyThesis/Dissertation