Image credit: Mark Avino
Image source: National Air & Space Museum
Grumman/Boeing
Category: Phase B Double Prime
2-Stage Flyback Booster Concept
Image credit: Mark Avino
Image source: National Air & Space Museum
Grumman/Boeing Design
Image credit: Grumman
Image source: Cradle of Aviation Museum
Booster Release
Image credit: Grumman
Image source: Cradle of Aviation Museum
Grumman/Boeing
Image credit: Grumman
Image source: Cradle of Aviation Museum
S-72-1201-X
Image credit: McDonnell Douglas
Image source: SDASM Archives
B-18E
Image credit: North American Rockwell
Image source: Numbers Station
Shuttle by Donald Bester
Image credit: North American Rockwell
Image source: Numbers Station
Single Large Booster
Our World in Space
Robert McCall & Isaac Asimov
New York Graphic Society, 1974
Image source: Numbers Station
S-72-464-S
Image credit: NASA
Image source: SDASM Archives
NAR Flyback Booster
Image credit: North American Rockwell
Image source: Numbers Station
