The Mammoth Book of "Vintage Science Fiction" is a collection of 10 short stories (i.e. around 50 pages each) from the 1950's. The authors contained in this volume include renowed sci-fi writers such as Asimov, Walter M. Miller (author of "Canticle for Lebowitz), Poul Anderson, Theodore Sturgeon, and Philip Jose Farmer; and it is edited by Asimov.
The collection features some great sci-fi - some of which is nostalgic, but it in a good way - while other stories actually seem quite timeless. The "Mammoth" Sci books (by Carroll & Graf Sci-Fi) are actually a series of 6 volumes from the Classic sci-fi of the 1930's, through Modern Sci-fi of the 80's. Based on this volume, and some of the titles in the 60's volume, it's too bad these volumes are out of circulation and somewhat difficult to find. This is a great collection of page-turning stories, and would make a good gift for Sci-Fi fans, young and old!