Ray's arithmetical key [electronic resource] : containing solutions to the questions in Ray's third book, and to some of the most difficult questions in the second book: also an appendix, of test examples for the slate or blackboard. By Joseph Ray ...
Imprint
New York, Clark, Austin & Smith; Cincinnati, W. B. Smith & co. [1858?]
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.