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Publisher
- Works Progress Administration of Pennsylvania10
- Board of Education of Prince George's County2
- Dept. of Agriculture, Soil Conservation Service (Lanham, Md.)2
- A. Hoen & Co (Baltimore)1
- Anderson, John.1
- Bowen, Emanuel1
- Boynton, G.W.1
- Carey, Mathew1
- Charity Organization Society (Baltimore, Md.)1
- Denison, J.1
- Department of the Interior, U.S. Geological Survey (Washington)1
- Dept. of Agriculture, Soil Conservation Service (Washington.)1
- Dept. of the Interior, U.S. Geological Survey (Washington, D.C)1
- Fry, Joshua et Pierre Jefferson1
- Geological Survey (U.S.)1
- H. & F.J. Huntington (Firm)1
- Harbor Board of Baltimore1
- Herman, Augustin1
- Hondius, Henry1
- Lewis, Samuel1