This collection consists primarily of records and papers relating to Philip Buehner's business activities. A significant quantity of this material is business-related correspondence, some of which relates to Buehner's work on water-supply projects in Seattle, Spokane, and Yakima, Washington. Also included is an 1893 agreement between Wolff & Zwicker Iron Works and Philip Buehner to enter into a contract with Hoffman & Bates to manufacture a steel conduit to bring Bull Run River water to the city of Portland, Oregon; materials relating to the Buehner Lumber Company, including a price list and minute book; patent records; contracts; rules and regulations of various water companies; and receipts. In addition to the business materials, the collection includes a draft will for Henry Habighorst, Buehner's father-in-law.