A NASA illustration (probably from 1964-66) showing the Saturn launch vehicles planned for the Apollo program. Note that the Saturn Ib shows the Lunar Module ascent stage, sans descent stage. This could have led to some interesting mission possibilities.
The full-rez scan has been made available to APR Patrons in the 2015-12 APR Extras Dropbox folder. If you’d like to help out and gain access to this and many other pieces of aerospace history, please check out the APR Patreon.