I bought this book for $1 at a used book sale (these books are everywhere) because it looked interesting. It is.
This book is neither propaganda nor, as another reviewer put it, a nostalgic view of the USSR. That wasn't the book's intention, and it doesn't read that way at ALL (not sure where those other 2 reviewers were coming from). It's simply a collection of photos from the one day in 1987 in 15 countries that made up the republic (I believe all 15 were depicted, I'm not going to check).
It was the first time photojournalists were allowed into the USSR and, as described in the book, it was not without its hold-ups, including such things as the Soviet government staging photo-ops and confiscating film/detaining photographers.
The main idea of the book (besides being the first to depict residents of the state) seems to be that people in the 1987-era Soviet Union were no different than anyone else on this planet. Despite the rigid structure of their government, at the core they were still people with jobs, families, friends, and lives. They are depicted carrying out everyday tasks and mundane activities, as well as having fun and enjoying life.
It's a remarkable book.