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.