If i were a hero, I'd be Martin Luther (Part 4442)....

 Superhero Anydays

Not sure where these are from because the covers of the actual mid-70s Annuals do not look like that.  Perhaps its the covers from a British or Australian version, or something like that. 

1975

Clockwise from upper left: Iron Man, Vision, Thor, Captain America

1976

Clockwise from upper left: Iron Man, Goliath, Thor, Hercules, Captain America and Scarlet Witch

1977

Clockwise from lower left: Vision, Thor, Iron Man, Black Panther, Scarlet Witch

1978

Clockwise from upper right: Iron Man, Black Panther, Thor, Captain America, Vision, Wasp, Goliath

POLT