Official record of Yellowstone management in 1901–1902, combining rules for visitors with major park improvements. This historical volume compiles the Acting Superintendent’s annual report and related notes from the Yellowstone National Park operations in 1901–1902. It covers daily life in the park, guidance for campers and travelers, and the administrative framework used to protect the landscape while expanding access to its features. The document also details engineering and infrastructure work by U.S. engineers, including road building, utilities, and site improvements at Mammoth Hot Springs and along key park routes. It includes a meteorological record for the period and notes on park administration, staffing, and facilities that shaped early 20th-century conservation and tourism. Visitor regulations and practical guidelines for campers, dogs, bikes, and boating. Progress reports on roads, bridges, drainage, and utilities across major park areas. Descriptions of construction of shelters, power plants, sidewalks, and lakeside facilities. Periodic weather data and climate insights from the park’s meteorological records. Ideal for readers of early national park history, researchers, and anyone curious about how Yellowstone was managed and improved in the early 1900s.