From the Archives | National Air and Space Museum https://airandspace.si.edu/archives-series?type%5Bstory%5D=story&editorial_series%5B162%5D=162&editorial_series%5B162%5D=162&editorial_series%5B162%5D=162&editorial_series%5B162%5D=162&editorial_series%5B162%5D=162&page=0%3Ftype%5Bstory%5D%3Dstory&page=4%3Ftype%5Bstory%5D%3Dstory&page=1%3Ftype%5Bstory%5D%3Dstory&page=2%3Ftype%5Bstory%5D%3Dstory&page=2
Clarke corresponded with numerous people.