The theory and practice of the longitude at sea. ... By Samuel Dunn; ...
Dunn, Samuel,-1794.
London : printed for the author and sold by him. Also, by his appointment, sold at several booksellers and mathematical instrument makers, in London and Westminster,
1778.
ESTC
Also reproduced on microfilm. Woodbridge, CT: Research Publications, Inc., 1986. The Eighteenth Century ; reel 1569, no. 17.