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<u>PILLOW PROBLEMS AND A TANGLED TALE</u> (Lewis Carroll),  
<u>PILLOW PROBLEMS AND A TANGLED TALE</u> (Lewis Carroll),  
<u>MATHEMATICAL RECREATIONS</u> (Kraitchik),  
<u>MATHEMATICAL RECREATIONS</u> (Kraitchik),  
<u>THE MASTER BOOK OF MATHEMATICAL GAMES FROM SCIENTIFIC AMERICAN</u>. } Surveyed by David Wells
<u>THE MASTER BOOK OF MATHEMATICAL GAMES FROM SCIENTIFIC AMERICAN</u>. }Surveyed by David Wells.
<br>Ad for <u>TRIPPPLES</u>, <u>INTERSECTION</u>, <u>TOTALLY</u>, <u>PUSHOVER</u>, <u>BARRIER</u>, <u>BALI</u>.
<br>Ad for <u>TRIPPPLES</u>, <u>INTERSECTION</u>, <u>TOTALLY</u>, <u>PUSHOVER</u>, <u>BARRIER</u>, <u>BALI</u>.
Ad for books: <u>CHAIN REACTION</u> (M. Petrushkin Ltd.) - based on <u>REVERSI</u>.
Ad for books: <u>CHAIN REACTION</u> (M. Petrushkin Ltd.) - based on <u>REVERSI</u>.