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The First Separate Atlas Map of Idaho Territory

A wonderful early map of Idaho Territory, published in Philadelphia by SA Mitchell Jr.

Only 11 counties are shown, pre-dating the addition of Washington County and Cass County.

Some minor Township surveying illustrated, along with towns, mountains, rivers, Indian Reservations, Forts, and the Rocky Desert of Lava and Basalt. 

The earliest obtainable map of Idaho Territory to appear in a Commercial atlas.

Samuel Augustus Mitchell Jr. Biography

Samuel Augustus Mitchell Jr. inherited the Mitchell Company from his father in 1860. For over thirty years, the company had specialized in the production of school atlases and wall maps of America. They were one of the pioneers on engraving on steel plates. In 1860, Samuel Jr. released the New General Atlas, which had been compiled in house and replaced a previous atlas by Tanner. The elder Mitchell died in 1868 and Samuel Jr. continued the business until the 1890s. At its height, the Mitchell Company employed 250 people and sold 400,000 publications annually.