An analysis of several recent drill services in arithmetic or an investigation into the amount of drill given to the various combinations

Wing, Albert Edwin2013-06-282013-06-2819261926b14709879https://hdl.handle.net/2144/6035Thesis (Ed.M.)--Boston Universityen-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictionsAn analysis of several recent drill services in arithmetic or an investigation into the amount of drill given to the various combinations - according to their relative difficultyThesis/Dissertation