Orton's lightning calculator, and accountant's assistant : the shortest, simplest, and most rapid method of computing numbers, adapted to every kind of business, and within the comprehension of every one having the slightest knowledge of figures / by Hoy D. Orton.
|Main Author:||Orton, Hoy D.|
[Philadelphia : T.K. Collins, c1866]
"Entered according to Act of Congress, in the year 1866 ... in the Clerk's Office of the District Court of the United States for the Southern District of Ohio"--T.p. verso.
Part of: Theodore P. Hill collection of early American mathematics books.
vi, -194 p. ;
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