The longitude logarithms in their regular and shortest order. Made easy for use in taking the latitude and longitude, at sea and land. By Samuel Dunn, Teacher of the Mathematical Sciences, London, Longitude Instructor to Gentlemen in the Sea Service, Author of several Treatises on these Subjects, &c - Dunn, Samuel d. 1794 (printed for the author, No. 1, Boar's-Head Court, Fleet-Street, 1793)