Download or read book A Key to an Introductory Course of Plane Trigonometry and Logarithms written by John Walmsley and published by Koteliansky Press. This book was released on 2010-03 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.