Book excerpt: Primary source collections from Idaho, Oregon, and Washington are described and evaluated. Covering a broad cross-section of libraries, museums, historical societies, and government archives this book provides a detailed look at 175 institutions and their collections. Descriptive entries cover contact information, facilities, material types, and multiple subject indexes to the holdings. Discusses the nature of archival research and lists digital resources and Web sites of interest to historians. The perfect tour guide for scholars engaged in writing about the history of the Pacific Northwest and related national topics.