Excellent collection of Golden Age SF and Fantasy (and often a mixture of both), sometimes with a dusting of Cosmic Horror. Certainly a lot of it is pulp, but it's highly superior pulp that very obviously influenced so many authors who followed in its author's footsteps. Hopelessly romantic, melodramatic, melancholy, full of adventure and atmosphere and wry joy.
I can think of no better way to some up this collection than to quote from its introduction (itself taken from The Encyclopedia of Science Fiction): "They are deeply healthy for the human imagination."
Thoroughly recommended for those with an interest in genre history, and for those who just like a bloody entertaining tale well told.