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This image is too small to be sure, but if it were Futura, you'd recognize it and you wouldn't be posting here. So based on the album's release date (1977) I'm going to guess it's Kabel, which was very popular in the 70s.
Alright, thank you!
A better image can be seen here. Click on the back cover thumbnail and then, again, on the image iteself.
Clearly not Kabel. My best guess is Century Gothic Bold.
I think it really is Twentieth Century Sans MT by Sol Hess and if not that then it is Avenir .