Of all the SF magazines, I think it's probably F&SF which has had the longest, broadest and deepest impact on the scene. All the others, I'm sure, have their plus points, but F&SF simply eclipses the rest of the field.
I couldn't resist a big pile of nearly twenty copies when I saw them on a stall at a collectibles fair last weekend. They are the US edition, which is often hard to find here in the UK, and my little handful ranges from the 1950s to the 1970s. I thought I would share some of the amazing cover art.