You have something really nice there and something very valuable. Your lithographs are part of a series called "Airplane Hangers," which was produced by Snyder and Black for the Coca-Cola from 1941 through 1945. These pictures were of paintings created by William Heaslip, a well-known artist and authority on military aircraft. The pictures were framed and hung in bottling plant lobbies and other places.
There were four sets in all. Set 1, from 1941-1942 consisted of 12 different pictures. Set 2 (1943), Set 3 (1944) and Set 4 consisted of 20 Airplane Hangers in each. There were 72 different planes in all.
You have Set 2 with the latest models of fighting airplanes used in combat by the Army and Navy in 1943. Planes like the Douglas B-19, Boeing B-17 and Lockheed P-38 are included. As a complete set in the original envelope and with hangers, it would be worth $1200 (2003). However, individually, each of these is worth $50 (2003). That makes your mint condition collection worth $900.00! These, however, are uncommon items and may be more of a value to World War II buffs than to Coke collectors. These could very easily bring a higher price.