Scope and ContentManual: Abney Levels. Uses and Applications with Appropriate Tables. Published by Keuffel & Esser Co., New York & Hoboken, copyright 1950; issued circa 1950-1960. Softcover, 4-3/4" x 7-1/4" high, pp. [2], 22 plus covers. Unused, fine condition. The manual has instructions for the use of several types of Abney levels including the one that it accompanied which was an improved version made for the U.S. Forest Service. It had a cover price of 50 cents. K&E had their main office and factories in Hoboken when this item was made.