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Book, 1977
Current format, Book, 1977, 1st U.S. ed, Available .
Book, 1977
Current format, Book, 1977, 1st U.S. ed, Available . Offered in 0 more formats
Demonstrates the fascination of numbers by revealing such secrets as how to add long columns of numbers in one's head, take square roots quickly, guess a friend's birthday, and determine the day of the week for any date since 1582
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