Plan of survey of the silver mining district, Thunder Bay, Lake Superior, Canada / compiled by Hugh P. Savigny, P.L.S.Savigny, Hugh P[1870]Coordinates not present on map and are approximated.Imperfect: mutilated, with some loss of text. Manuscript annotations on map. Manuscript title on verso: Thunder Bay Silver Mining District. From the Richard H. Rickard Papers.Inset: plan of town plot, Fort William.Relief shown by hachures.cartographic