This issue has variants.
There is a known seventh Canadian printing for this variant, red maple leaf stating “Published in Canada” on cover instead of Pocket Books logo. Without the Pocket Book or red maple leaf variant is probably the seventh and eighth printing U.S. edition. Date listed from known seventh Canadian variant.
Listed is the Standard Book Number, the precursor to the ISBN.
Copyright 1950 by Ripley Enterprises, Inc. Games genre listed on book.