Plan of Fort Pitt and parts adjacent with both rivers / by B. Ratzer, 1761. 1761.
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Ratzer, Bernard
http://n2t.net/ark:/99166/w6f20jjb (person)
Epithet: military surveyor British Library Archives and Manuscripts Catalogue : Person : Description : ark:/81055/vdc_100000000296.0x000390 ...