This is the Grolier Encyclopedia Year Books for years 1966 - 1981.
All are in overall great shape.
1974 book has some water damage on the cover as per photo shown.
Most of the spines have not been cracked on the books.
Selling them separately by the year due to what it would weigh for whole set.
Each book has The World in Review for that year, such as Articles of the Year, Chronology of Events etc.
The odd one has some sun discoloration on spine or the color is different from the spine to front.
If you would like any more pictures or have questions please just message.