Richardson, Doris Jeannette2017-01-122017-01-1219481948b1471145x(OCoLC)7858638https://hdl.handle.net/2144/20020Thesis (M.S.)--Boston University, 1948. 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