Hello Scott,
It is all interesting, including the events covered in your attachments which occurred after the death of FDR: the B-36 was becoming relevant again as the postwar maps were being drawn.
The FDR library is quite an under-appreciated source for aviation researchers. This page is the mother-lode:
http://www.fdrlibrary.marist.edu/arc...dingaid&id=502
See the 'A' section for aviation.
Thanks.
Bruce