United States National Museum, Smithsonian Institution, United States. Department of the Interior · Washington : Smithsonian Institution Press, [etc.]; for sale by the Supt. of Docs., U.S. Govt Print. Off. · leaf 370
U. S. NATIONAL MUSEUM BULLETIN 102, PART 7 PL. 3 Natural Gas Main Line Construction Conditions.
Science
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
