The reefs of Space

Underwater adventure

Willard Price

The Space Boat

William Murray

Invaders from outer space

Philip Brooks

The Space Between Us

Spacesuits

James Jr. Buckley

World Without Stars

Poul Anderson

Earth is Room Enough

Isaac Asimov

Undersea Quest

Frederik Pohl \ Jack Williamson

Ring Around The Sun

Clifford D. Simak

Wolfbane

Frederik Pohl \ C. M. Kornbluth

Earthman, Come Home

James Blish

Dreadful Sanctuary

Eric Frank Russell

Gladiator at Law

Frederik Pohl \ C. M. Kornbluth

Drunkard's Walk

Frederik Pohl

Imperial Earth

Arthur C. Clarke

The Caves of Steel

Isaac Asimov

The Currents of Space

Isaac Asimov

Transit

Edmund Cooper

The Heaven Makers

Frank Herbert