This is volume 13 of the Harver Junior World Encyclopedia set. Published in 1972 - this book contains information that falls between the categories Rockets - Sound! This volume has 83 illustrated and informational pages. It is a 7.5" by 10.5" hardcover book.
The book covers have label residue, corner bumps and spots. The binding is tight. The pages are clean and free of writing, rips, tears, or creases. It is in very good condition.