United States; Army; Ordnance Dept 
Description of the Colt’s Double-Action Revolver, Caliber .45 Model of 1909 [PDF ebook] 
With Rules for Management, Memoranda of Trajectory, and Description of Ammunition, September 10, 1909, Revised June 30, 1913

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. This manual is published for the information and government of the Regular Army and Organized Militia of the United States.