Expendable Second Stage

Image credit: North American Rockwell
Image source: Numbers Station

Gemini Launcher

Image credit: North American Aviation
Image source: AFMC

Minuteman Launcher

Image credit: North American Aviation
Image source: AFMC

Design 532

Image credit: Grumman
Image source: Mike Acs

B-18E

Image credit: North American Rockwell
Image source: Numbers Station

Shuttle by Donald Bester

Image credit: North American Rockwell
Image source: Numbers Station

S-72-464-S

Image credit: NASA
Image source: SDASM Archives

Booster Separation

Exploring Tomorrow in Space
Thomas Becker
Sterling, 1972

Image credit: Grumman
Image source: Numbers Station

Grumman/Boeing 2-Stage Concepts

Image credit: Grumman
Image source: Mike Acs