The Merchants National Bank of Helena, Montana, was originally established as L.H. Hershfield and Co. in Virginia City, Montana Territory, and for many years operated as L.H. Hershfield and Bro. It went into receivership in 1897. Records (1865-1903) consist of correspondence, financial records, legal documents, and organizational materials. There are subgroups for the White Sulphur Springs Association and for the United Hebrew Benevolent Association.

Frank Sizer was a Helena and Butte, Montana, mining engineer. He managed the Whitlach-Union, Spring Hill, Eclipse-Argo, and Gould mines; worked for Canoll and Martin; and served as a consultant to William A. Clark in his Colusa Parrott law suit and his purchase of the Rosario Mine in Mexico. Collection (1878-1909) includes correspondence, financial records, legal documents, diaries, scrapbooks, clippings, and notebooks.