Tables of difference of latitude and departure: constructed to every quarter of a degree of thr quadrant, and continued from one, to the distance of one hundred miles or chains.

by Robertson, J. (John), 1712-1776
Philadelphia: : Printed and sold by Joseph Crukshank, in Market-Street, between Second and Third-Streets, 1785

Tables of difference of latitude and departure: constructed to every quarter of a degree of the quadrant, and continued from one, to the distance of one hundred miles or chains.

by Robertson, J. (John), 1712-1776
Wilmington [Del.]: : Printed by Bonsal and Niles, for Zachariah Jess., 1799