The theory of Hadley's quadrant, or the rules for the construction and use of that instrument demonstrated. By the Reverend Mr. Ludlam.

London : printed by R. Hett, and sold by T. Cadell, in the Strand, M.DCC.LXXI. [1771]

[4],30p.,plates ; 80.

ESTC T150154

Electronic reproduction. Farmington Hills, Mich. : Thomson Gale, 2003. (Eighteenth century collections online). Available via the World Wide Web. Access limited by licensing agreements.