Here is adventure--BEYOND THIRTY
The United Americas had been isolated for hundreds of years while the rest of the planet was wracked by incessant warfare. The Commander of an American ship patrolling the Eastern sea frontier on 30 degrees West longitude is cast adrift with three seamen by a treacherous fellow officer. The four men reach the coast of England to find a land of blasted cities. Saber toothed tigers of a new species and giant wolves have decimated the surviving naked savages. Battle and adventure on the Continent make this an exciting escape to the future.

More adventure--THE MAN-EATER
A huge African lion, how he was captured and brought to the United States, and his unwitting help in serving the cause of justice. Typical jungle adventure made famous by Edgar Rice Burroughs.