Social Problems Through Science Fiction (1975, Paperback)

I was looking for this book in particular. I had it while I was in college, and turned it in at the end of the semester - and have regretted turning it in ever since. I've often thought about, or told people about the unique stories. This book has been out of print for years, and I was lucky enough to find it on ebay - for a great price, I might add.