Boss, Hazel K.2017-04-202017-04-2019441944b14721624(OCoLC)7865903https://hdl.handle.net/2144/21559Thesis (M.S.)--Boston University, 1944. This item was digitized by the Internet Archive.en-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictionsThesis/Dissertation