The first edition of Heart has the letters ABCDEFG on page 160. Copyright © 1974 by Western Publishing Company, Inc. Published by Golden Press, New York, N.Y. Cover price is $1.95. The number on the spine is 24354. Listed as a Golden Guide on the cover and a Golden Science Guide on the inside front cover. One of the scarcer titles to find.
This title also exists in a large (5 ¼ by 7 ¾ inch) hardcover. The ISBN number on the back cover is 0-307-64354-9.
No cover variant or revised edition exists. Out of print.