for manned Venus Fly by
that's Bellcomm. Inc proposal from Feb 1967
its a 'wet workshop' S-IVB
standart Apollo CSM Block III/ Saturn V but the LM is replace
by conical Environmental Support Module (ESM)with airlock, supplies, Probes.
after launch on October 31, 1973
the S-IVB reignites to Venus, after that the Crew dock the CSM on ESM
vented any remaining S-IVB fuel into space
during the first week of mission the crew rebuild LH2 tank into Space Station
four months later at march 3, 1974 the S-IVB pass Venus in 6185 km distance
several probe are drop
December 1, 1974 the S-IVB return Earth
the Crew return in CSM separate from S-IVB and return to Earth
Bellcomm Propsal
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19790072165_1979072165.pdf
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19790072306_1979072306.pdf
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19680009763_1968009763.pdf
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19790072080_1979072080.pdf
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19790072583_1979072583.pdf
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19790072066_1979072066.pdf
the most famous Apollo Mars Fly-By proposal is from North America Aviation
were used modifide CSM Block 3 and conical Space Station Module
http://www.secretprojects.co.uk/forum/index.php/topic,5316.0.html
Douglas proposed MORL Station with Apollo Block III for Mars Fly-By