The Ringworld Engineers

Eon

Greg Bear

1984

Covers from OpenLibrary

Ringworld

Larry Niven

1970

Covers from OpenLibrary

The Mote in God's Eye

Larry Niven

1974

Covers from OpenLibrary

Have Space Suit—Will Travel

Robert A. Heinlein

1958

Covers from OpenLibrary

The Garden of Rama (Rama, #3)

Arthur C. Clarke

1991

Covers from OpenLibrary

Footfall

Larry Niven

1985

Covers from OpenLibrary