L. Auerbach and Brother was a wholesale and retail store in Helena, Montana Territory, specializing in notions, liquor, cigars, etc. The firm was owned by Leopold Auerbach and his brother William Jacob Auerbach. Records (1868-1880) include a letterpress book of outgoing correspondence, ledgers, cash sales books, daybooks, journals, inventories, etc. There is also one cash book (1878-1879) for Auerbach, Wells and Company.

This collection consists of views of Montana placer mining, hard rock mines and mills, coal mines, and kilns primarily between the years 1867 – 1920. Well-represented are early views of placer mining in Alder Gulch and in the Rimini mining district, larger-scale hard rock mining in the Marysville mining district, and mines and smelters in Butte. The collection also includes views of coal mining operations in Carbon, Fergus, Gallatin, Park, Powder River, and Sheridan counties.