“CONCEPT OF VIKING LANDER TO BE LAUNCHED TO MARS IN 1975
Robot Spacecraft to Search for Life in the Martian Soil.”
Also:
“The Viking lander design went through a number of versions in 1968 and 1969. The three-legged September 1969 design added a second camera for stereophotography and moved the meteorology instrument to the high-gain antenna mast.”
At:
history.nasa.gov/SP-4212/p218b.html
Disregard the terminal propulsion nozzles (3 places) being also labeled as “fuel tanks”…ugh. Proofreading anyone?
Possibly on display…at Martin Marietta’s Denver HQ?
A subsequent design iteration…also in the same…building…lobby?
www.gettyimages.com/detail/news-photo/the-viking-lander-w...