Spot on, pixel-accurate reproduction of the Part 2 of User's Manual for pre-war Leica camera issued in English, in 1938 by Leitz. It would come with the cameras sold in the USA. Leitz US headquarters were in New York, 730 5th Avenue. 24 pages with text and photos on high quality glossy paper. 
It's the second of the set of 3 parts of "Directions". This one is for the lenses. Remaining two are for camera itself (Part 1) and the accessories (Part 3). 
 
For the ultimate set, check the envelope in whch the instructions came sold along with a registration card - both can be stamped with the serial number of your beloved Leica!