Вид на Форт Робертдо в долине Синкинг-Спринг, штат Пенсильвания

Print shows Fort Robertdeau at the lead mines in Sinking Spring Valley in Pennsylvania.

Illus. in: The Columbian magazine, or, Monthly miscellany. Philadelphia : Printed for Seddon, Spotswood, Cist, and Trenchard, 1788 December, opp. p. 703.
Published in: The American Revolution in drawings and prints; a checklist of 1765-1790 graphics in the Library of Congress / Compiled by Donald H. Cresswell, with a foreword by Sinclair H. Hitchings. Washington : [For sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1975, no. 573.