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This collection comes from the Idaho Transportation Department's main headquarters located in Boise, Idaho. Altogether it consists of hundreds of thousands of unique documents and photographs created and used by the organization throughout the 20th Century. The collection includes content created for internal use (surveys, plans and schematics, research projects and experiments, photo documentation, etc.), but also comprises a number of externally-oriented content (promotional, public relations and outreach, public hearings, commemorations, dedications, etc.), as well as basic documentary evidence of the department’s buildings, laboratories, personnel, and seasonal events dating from the early 1900s up to 2012, when the documents were transferred to the Idaho State Archives. Together this collection illustrates the whole of Idaho’s transportation history.