Burnham's arithmetic, revised. [electronic resource] A new system of arithmetic, on an improved plan: embracing the rules of three, single and double, direct and inverse ... and all proportional questions in one rule applicable to the whole, the process greatly simplified and abridged. By Charles G. Burnham, A.M.
Electronic text and image data. Ann Arbor, Mich. : University of Michigan, Digital Library Initiatives, 2000. Includes both TIFF files and keyword searchable text. [Making of America] This volume is made possible by a grant from the Andrew W. Mellon Foundation as part of Making of America IV: the American voice, 1850-1877.