There are 3 books in the Hammer's Slammers combo volumes series. The newest book is The Complete Hammer's Slammers Volume 3 which came out in 2010.

1
The Complete Hammer's Slammers

Book cover of The Complete Hammer's Slammers
The bestselling series that rocketed David Drake to Military Science Fiction stardom is collected in this first of three volumes.
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3
The Complete Hammer's Slammers Volume 3

Book cover of The Complete Hammer's Slammers Volume 3
This three volume set presents for the first time the genre-defining Slammers series in a uniform hardcover set. This volume features the final two Slammers novels, The Sharp End and Paying the Piper, as well as an ori