Gang, Vera Mary2016-10-122016-10-1219381938b14721284(OCoLC)7864379https://hdl.handle.net/2144/18201Thesis (M.S.)--Boston University, 1938. 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