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The series (which ran for 261 books) can be found for free on several legitimate digital libraries: Here is a list of Nick Carter Killmaster
Written under the house pseudonym "Nick Carter" by authors like Michael Avallone and Gayle Lynds nick carter killmaster books free download
: If you prefer listening, you can find free public domain audiobooks of the early Nick Carter detective mysteries, such as A Network of Crime Internet Archive Series Highlights: Why Read Nick Carter?