“East River Bridge Plan of one Tower” [Brooklyn Bridge], By John A. Roebling, 1867, Ink on tracing linen (National Archives Identifier: 594709); Civil Works Map File, 1800 – 1947; Records of the Office of the Chief of Engineers, 1789 – 1988; Record Group 77; National Archives.
View Plans for the Brooklyn Bridge Towers via Today’s Document from the National Archives
An interesting link found among my daily reading