Rex Humbard Foundation, Akron, OH, 1979.  93 pages including Order/Pledge form.  Card wraps with some soil and spine end wear; bit of rust on staples.  Interior clean and unmarked; small hole on pp. 29/30 in white space not affecting text.  Includes envelope entitled ‘Faith-Building Tools’ with two keys, two peel and stick labels with Prayer Group phone number, and unsigned Lifetime Membership card; 1980 calendar on back of card.  ‘This book is designed to strengthen your Christian life through these three activities.  If you are a Prayer Key Family member you have committed yourself to unite with the rest of our worldwide family in prayer, fasting, and giving – and this book will help you understand how and why you should do these things.’ (from Introduction)