The entire set of the 15 books that collected his "Mathematical Games" columns from Scientific American are available in PDF form on a CD-ROM:
http://www.amazon.com/Martin-Gardners-Mathematical-Games-Gar...
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The entire set of the 15 books that collected his "Mathematical Games" columns from Scientific American are available in PDF form on a CD-ROM:
http://www.amazon.com/Martin-Gardners-Mathematical-Games-Gar...