ORTON'S LIGHTNING CALCULATOR AND ACCOUNTANT'S ASSITANT
Philadelphia: Collins, 1866. Hard Cover. 12mo - over 6¾" - 7¾" tall. "The shortest, simplest and most rapid method of computing numbers adapted to every kind of business". Examples, problems, and practice. Foxing throughout, pencil notes on inside front cover, a black spot on front not effecting print, dark spots..... More