Content Description The Boeing PW-9 (Model 15) Blueprints is a small collection consisting of 22 sheets of blueprint diagrams of various portions of the Boeing Model 15, also known as the PW-9, used by the U.S. Army Air Service in the 1920s and early 1930s. The sheets are stamped January 26, 1926. The sheets are labeled: assembly and installation, flight control board assembly, instruments cowl assembly, lower sta. #3 to #5 cowling assembly, PW-9...