For me, it was "Bobby Fischer Teaches Chess". Very basic stuff , but enough to hook me to the game 
https://www.amazon.com/Bobby-Fischer-Teaches-Chess/dp/0553263153
My First Chess Book
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How to Play Chess by Kevin Wicker, Treasure Press 1988, UK. A beautifully produced hard cover book for the princely sum of $6.95 Australian.
IMBacon wrote:
That was my first chess book too!
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My first book i read completely was The Complete Chess Course by Reinfeld. I also read some of Weapons of Chess by ??. The first 2 i bought and read were logical chess and How to improve your vhess