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I would look at the books as seperate rather than as a whole as kyrilson is. Dirk Pitt and the NUMA files are pretty much together in terms of subject matter and writting quality goes, I am not going to tell you how the Dirk Pitt books are related to the NUMA files, which would spoil the books. However I can tell you to read the Dirk Pitt books before going to read the NUMA files, the Pitt books will explain some things about the NUMA files that you need to know.
The other series are not related to the Pitt and NUMA files in any way.
Isaac Bell does not work for NUMA and takes place many years before the formation of NUMA. To tell you more will ruin the books.
The oregon files books do not related to NUMA so they need to be considered sperately,
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