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Best Choice Michael O'Mara Books 
The Private Investigator Puzzle Book: Over 90 Puzzling Cases to Crack Best Value Independently published 
How to become a private investigator: Break into the industry with little or no experience Audible 
Introduction to Conducting Private Investigations: Private Investigator Entry Level (02E) CREATESPACE 
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The Private Investigator’s Field Guide: Strategies and Checklists for Every Case Independently published 
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