Pic one is the Saturn V INT 20 and 21 vehicles-- INT 20 lost it's S-II stage, putting the S-IVB directly atop the S-IC which dropped a center F-1 engine, as mentioned in a previous study summary. The INT 21 version was basically what launched Skylab, with only the S-IC and S-II stages operational with the payload on top. I sent this one over to paint as well and added the tags listing the performance to help keep things straight...
The second pic is a performance chart to various orbits and inclinations... rockets launching out of KSC are flying into a 28.5 degree orbital inclination, since that's how far north KSC is from the equator. The further north from the equator the launch site is, the lower the 'assist' from earth's rotation, which is fastest at the equator. So the further north or south you go, the less payload capability the rocket can deliver for the given amount of fuel and ISP it has. Rockets going into polar orbit get essentially zero 'free ride' since they're launching north-south instead of east-west, and have the "lowest" performance. Highly inclined orbits like ISS (51.6 degrees) also inflict a payload hit on the rockets launching into that inclination, even from more southerly launching points, due to the need to fly north instead of due east and therefore sacrificing some of the 'free speed' from earth's rotation. BUT, it DOES make it possible for other nations with launch sites further north than ours (Russia chief among them) to be able to access the ISS from their launch sites without a very costly (in terms of fuel and therefore payload capability) orbital inclination change to match orbits and dock with the ISS. It also means, though, that launchers flying from those northerly launch sites would have less payload capability than if they were launched from sites further south closer to the equator.
Interesting that they were looking at all the different inclinations for space station missions even back then... they even proposed a very similar inclination to the ISS orbit (49.5 degrees IIRC instead of ISSs 51.6 degrees) to overfly the entire US except Alaska. More on space stations later...
Enjoy! OL JR