1. A plan of the city & fortifications of Louisburg : from a survey made by Richard Gridley, Lieut̂é. Col. of the train of artillery in 1745. Maps Pennsylvania State University Public content 1745. Scale ca. 1:7200.; Scale ca. 1:36,000.; 2 maps on 1 sheet; 27 x 36 cm Fortification--Nova Scotia--Louisbourg--Maps. [J. Hinton].