A diagram of the triangulation for the survey of the coast of the United States made in 1817 and 1833 : and the secondary triangles made in 1833 & 1834 in Connecticut & upon Long Island.

Shows triangulation lines connecting base points in southwestern Connecticut, western Long Island, and New York City vicinity.
Rubber-stamped at foot of title: Copyright secured according to law.
Annotated/signed in ink on verso: Survey of Long Island & Connecticut s. coast, 1817, 1833, & 1834. M. Fillmore.
LC copy imperfect: Use-worn, fold-lined, soiled on verso.
Available also through the Library of Congress Web site as a raster image.