https://en.wikipedia.org/wiki/Atomic_bombings_of_Hiroshima_and_Nagasaki
Groves expected to have another “Fat Man” atomic bomb ready for use on 19 August, with three more in September and a further three in October;[91] a second Little Boy bomb (using U-235) would not be available until December 1945.[235][236
https://nsarchive2.gwu.edu/NSAEBB/NSAEBB162/72.pdf
That’s a pretty amazing .pdf.
Where do we go to get an equivalent about JFK and Jan6?