Andrus, Felix Walter2012-09-062012-09-0619501950b1471534https://hdl.handle.net/2144/4033Thesis (M.A.)--Boston University, 1950en-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictionsThe presentation and evaluation of a unit on the structure of matter for twelfth-grade college chemistry classThesis/Dissertation