The website at: http://www.ibiblio.org/hyperwar/USA/ref/TM/index.html Has a rather better copy of the manual for the BC-611 than is available at BAMA, in case you have one of those critters. You can also get other manuals there, including for example, the manual for the 75MM gun they used in the B-25H, if you have one of those, too. Wayne