Beneath the Planet of the Apes by Author Michael Avallone. This is the novelization of the second Planet of the Apes film and picks up right after the events of the first film with Taylor and Nova heading into the Forbidden Zone. Soon after Taylor goes missing behind a mental projected wall of ice leaving Nova to head back to Ape city in search for help. While this is going on Bret and his ship have just crashed on Earth and he his commanding officer lies dying in the hot sun. Once his commanding officer is gone he barres him and runs into Nova as he begins to explore the wasteland that he found himself in. Nova takes him to Ape city where he meets Zera and Cornelius who tell him of Taylor and give him garb to make him look like a human in that time. As this happens the gorilla General decides that the people of the Forbidden Zone must give up their land so that the Apes can spread out from Ape city into the rest of the country. Bret and Nova pass the ape army as they return to the Forbidden Zone and find out that Taylor had come across the mutants who live underground and who worship the bomb.
Escape from the Planet of the Apes by Author Jerry Pournelle. This is the novelization of the third Planet of the Apes film. The year is 1975 and the only survivors of the holocaust caused by the bomb have taken Taylors ship back through time and crashed off the coast of California. Once they are rescued by the Navy they are taken to the LA Zoo where Dr, Milo is killed by a gorilla in the cage next to theirs. This turn of events makes Zera and Cornelius the only survivors of what happened in 3955. But as they begin to speak the head science advisor to the president warns of humanities downfall by their son and wants to kill both Apes which leads them to have to escape from the facility that they where held in and Zera to give birth to their child who in this novelization is not called Caesar but Milo after their friend. This is a great omibus and one that I recommend to all Planet of the apes fans and all science fiction fans too.