Drane, E.O. (Enardoe) & Robert Parrish: Enardoe's Tru-Tone Life-Time Linking Rings ©1975 Edward O. Drane & Co. Softcover, saddle-stitched, 5.5x8.5", 6 pages

Image courtesy eBay seller Slacks!

Comments: Instruction manual that came with the Enardoe's Tru-Tone Linking Rings; text by Robert Parrish.

Contents (from book):

1 Introduction
1 Basic Principles of the Linking Rings
1 Using the Key
2 Folding the Chain of Three

2 A Modern Linking Ring Routine
2 Arrangement of the Rings
2 Counting the Rigs
2 Returning the Rings to the Left Hand
2 Linking Three Rings
3 Linking Two Rings
3 Linking Three More Rings
3 Collecting the Rings
3 Making a Chain
3 Shaking the Chain Into a New Formation
4 Removing a Single Ring
4 Unlinking Two Rings
4 Unlinking a Single
4 Fancy Figures
4 A Snarl of Rings
5 Separation of All Rings
5 Final Moves

6 An Effective Move: The Dropping Ring
6 Concluding Advice
7 Selected References