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]
Part of: Theodore P. Hill collection of early American mathematics books.
"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.
vi, -194 p. ;
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