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Author
- Geological Survey (U.S.)30
- Wood, Gordon H. (Gordon Harry), 1919-5
- Berryhill, Henry L. (Henry Lee), 1921-2
- Butts, Charles, 1863-19462
- Campbell, Marius R. (Marius Robinson), 1858-19402
- Kent, Bion H. (Bion Huntley), 1925-2
- Roen, John B.2
- Shaw, E. W. (Eugene Wesley), 1881-19352
- Stose, George Willis, 1869-19602
- United States. Bureau of Public Roads2
- Alvord, Donald C. (Donald Clayton), 1922-1
- Bascom, F. (Florence), 1862-19451
- Clapp, Frederick G. (Frederick Gardner), 1879-19441
- Martin, G. C. (George Curtis), 1875-19431
- Munn, M. J. (Malcolm John), 1874-19491
- Owens, James Patrick, 1924-1
- Pennsylvania. Bureau of Topographic and Geologic Survey1
- Pomeroy, John S., 1929-1
- Stone, Ralph W. (Ralph Walter), 1876-19641
- Swanson, Vernon Emanuel, 1922-1
