Become a Top Secret Covert Spy Agent

Become A Top Secret Agent / Training Grounds
Here is a collection of the most important reports and articles to keep your "spy" skills in order.

Information
Use of Spies Centuries Old
Police Codes CB commincated, etc.
Government Scanner CB Radio Frequencies.
Business Intelligence Gathering The basics
Cryptography Basics Encryption
Skip Tracing The Basics
Skip Tracing II Intermediate
Finding Info Online 16 Rare Tips
Analysis of Email Headers Behind the coding
Ip Spoofing Fake ID Online
Become A Spy Become A Secret Agent (or not)

Books

CIA, Inc.: Espionage and the Craft of Business Intelligence