1. Map of the Iron River silver district, Ontonagon County, Mich. / J.M. Longyear, sc. Creator: Longyear, John Munro, 1850-1922 Published / Created: [between 1870 and 1879?] Call Number: BrSides Double Folio 2018 100 Image Count: 1 Resource Type: Maps, Atlases & Globes Found in: Beinecke Rare Book and Manuscript Library > Map of the Iron River silver district, Ontonagon County, Mich. / J.M. Longyear, sc.