hardcover, 301 pages
Published Aug. 27, 1944 by Macmillan.
Calculus Made Easy
Being a very-simplest introduction to those beautiful methods of reckoning which are generally called by the terrifying names of differential calculus and the integral calculus
The classic book on infinitesimal calculus by Thompson, originally published in 1910; then updated with additional material in 1998 by Martin Gardner.
