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I have the book and it is a very interesting read, both as to the origin of the concept and as to the various attempts to meet it.  It also talks about other "Convoy Protector" (USAAF-MD term for this kind of aircraft) studies, such as combining the YB-40 with the XB-38, a similar heavily armed variant of the Martin B-26 (paper only), and a "Convoy Protector" version of  the B-29 (one prototype, later returned to normal B-29 configuration).