- Hassler, F. R. (Ferdinand Rudolph), 1770-1843
- Digital Commonwealth
- Atwood House Museum of the Chatham Historical Society
Title from item. Aids to navigation corrected to 1878. Date from item. From a trigonometrical survey under the direction of F.R. Hassler and A.D. Bache, Superintendents of the Survey of the Coast of the United States.
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