Records of the Oregon Timber Transport Operators document its formation in 1951 and operation through 1957. The records include bylaws and policies, newsletters, membership records, correspondence, press releases and newspaper clippings, a speech, and ephemera. The records are not comprehensive but appear to have been assembled by Edward H. Crosby, manager of the Columbia Basin Loggers in Portland, Oregon, who took a leadership role in OTTO's organization and operations.