License, verbatimUS-PD
The New York Public Library states no known U.S. copyright for this item. Pinax admits it as US-PD only because the work predates 1900, making public domain near-certain worldwide; status outside the U.S. is not asserted and reuse elsewhere is the user's responsibility. Credit: From The New York Public Library.
Ulic (John A.B.) Dahlgren's Naval Battery. Road to Fairfax County, near Alexandria. July 29th, 1861. 1861 (from title). The New York Public Library.