Kudos to the non-geek marketing types who composed the marketing letter for The Magazine of Fantasy and Science Fiction, wherein the first lines are:
Human Space Colonies in the 21st Century?
The Viking Orbiter and the Mars Rover have brought us one step closer.
Whyever would a serious student of the space program focus on the Viking Orbiters when the program included two landers of its own. In the nineteen-by God-seventies?
I suspect the person who wrote the copy just didn’t know.