- CollectionM190 - Regina Becker Collection
- ItemM190-0001 - Henry J. Martens excursion to Kern County, California
- ItemM190-0002 - Henry J. Martens with Henry Hodel, Gustav Weyand, and P. B. Harms
- ItemM190-0003 - Henry Martens excursionists visiting southern California, August 1909.
- ItemM190-0004 - Harms family home in Martensdale, California
- ItemM190-0005 - View of Martensdale, California, winter of 1909-1910