Cita APA (7a ed.)

U. S. Geological Survey. (1886). Sketch showing progress of triangulation in the Appalachian region. U. S. Geological survey.

Cita Chicago Style (17a ed.)

U. S. Geological Survey. Sketch Showing Progress of Triangulation in the Appalachian Region. [s.l.]: U. S. Geological survey, 1886.

Cita MLA (9a ed.)

U. S. Geological Survey. Sketch Showing Progress of Triangulation in the Appalachian Region. U. S. Geological survey, 1886.