This document provides guidance on identifying and evaluating primary sources for historical research. It defines primary sources as original materials created during the time under study that serve as evidence for interpreting the past. Examples given include letters, diaries, newspapers, government documents, images, and more. The document instructs researchers to carefully evaluate primary sources by considering their authorship, purpose, and potential biases to determine their reliability and suitability for a given research task. Researchers are directed to reputable library databases and websites to find primary sources suitable for analyzing the Cold War era.