Here's a fairly random collection of magazine covers starting from 1968 and ending in 1986. I chose this time frame because this fairly accurately captures the boundaries Retrospace covers on a regular basis. I also tried to avoid types of magazines which Retrospace posts on frequently: Detective mags, Girly mags, Action mags, Biker mags, Horror mags, and Humor mags.
And one last note: I could have easily gone through and posted People and Newsweek covers and it would've been a "memory lane" type of post. However, I try to tread in areas off the beaten path, so there's some odd ones in there, and several non-US periodicals. But that's what makes it interesting (to me, anyway). So, enjoy.