Zufall, Bernard: Zufall’s Memory Trix No. 5 Memorizing Numbers ©1940 Berdard Zufall, NY Softcover, saddle-stitched, 5.5x8.5", 9 pages Available as an eBook compilation of all 6 volumes from Lybrary.com

Image courtesy eBay seller Slacks!

Comments: Feats of Memorization. Zufall published a series of 6 volumes in the Memory Trix series, including:
No. 1 Magazine Memorizing
No. 2 Mental File Index
No. 3 Calendar Memorizing
No. 4 Memorizing a Deck of Playing Cards
No. 5 Memorizing Numbers
No. 6 Memorizing Facts and Figures

Contents (Partial, from page images, numbers are not page numbers):

1 A Question: problem presented
2 Effect: performer is able to identify any number in a large 10x10 grid when given the coordinates
3 Preparation
4 Dollar Bill Trick: serial numbers

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