DeCourcy, Ken: Leo Leslie's Triple Colour Cups and Balls ©Unkown, The Supreme Magic Co. Softcover, saddle-stitched, 8.5x11", 6 pages

Image from Magicref

Comments: a cups and balls routine using red, blue and yellow balls. Aldo Colombini has a current version of this routine called "Tri-Color Cups and Balls". Available as an e-Book from Lybrary.com

Contents (from book):

i Foreword (Ken de Courcy)
1 A Word About the Cups and Balls

1 Leslie's Triple-Colour Routine
1 Secret: and tips on balls to use
2 Preparation
3 Explanation: through page 6