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Re:Ask HN: Sales book recommendation? by AlleyRow on Saturday April 18, 2009 @02:57PM (#568593)
The 100 Best Business Books of All Time has a list of 12 Sales/Marketing books on this page: http://100bestbiz.com/more-on-the-100-best/

The list as a whole is pretty solid.

Re:Ask HN: Sales book recommendation? by melvinram on Saturday April 18, 2009 @03:04PM (#568601)
Selling the Invisible by Harry Beckwith from the list is a good one.