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The Central Fire Control Manual - the handbook and operation of service instructions. October 15, 1943

B-29 GUNNERS INFORMATION FILE- This is in PDF form and in 3 sections.
Gunners Operation - Part 1

Gunners Operation - Part 2

Gunners Operation - Part 3

AAF WTCC- Flight Engineer Handbook B-29 This is a PDF file. This file is 164 pages long.

Pilot's Flight Operating Instructions for Airplanes Army Models B-29 & B-29A
This is a PDF file that is 118 pages long.