Shepard, William H2016-08-052016-08-0519491949b1480573x(OCoLC)08000281(OCoLC)ocm08000281https://hdl.handle.net/2144/17254Thesis (M.S.)--Boston University, 1949. 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