Scott's standard postage stamp catalogue (The encyclopedia of philately) 
edited by Gordon R. Harmer. 
 - New York  Scott Publications Inc.  1951. 
 - Published annually in 2 volumes 
<br/><br/> 03528G Vol. 1. The Americas and the British Commonwealth of Nations. 107th ed. 1951.  03527G Vol. 1. The Americas and the British Commonwealth of Nations. 112th ed. 1956.