Question Mark? Period-ical.

So I've got another image puzzle for you folks. Below is a series of twenty covers from contemporary magazines all of which should be able to be picked up at any standard periodical retailer. Of course, just like last time, I've removed the titles to each. How many can you name? I'll give you a hint: Hustler isn't one of them. Neither is The National Review. I didn't want to be offensive.