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- Museum number:
- 1-93753
- Object class:
- Hammerstones
- Collector:
- Francis A. Riddell and Richard Shutler Jr.
- Collection place:
- CA-Las-31, Lassen County, California
- Museum number:
- 1-197962
- Object class:
- Hammerstones
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-67, Lassen County, California
- Collection date:
- August 31, 1955
- Museum number:
- 1-202291
- Object class:
- Hammerstones
- Collector:
- Francis A. Riddell, James Allan Bennyhoff, and Richard Shutler Jr.
- Collection place:
- CA-Las-90 (Amedee Cave), Lassen County, California
- Collection date:
- July 1951
- Museum number:
- 1-93659
- Object class:
- Hammerstones
- Collector:
- Francis A. Riddell and Richard Shutler Jr.
- Collection place:
- CA-Las-86, Lassen County, California
- Collection date:
- January-February 1951
- Museum number:
- 1-108473
- Object class:
- Hammerstones
- Collector:
- Arnold R. Pilling, Francis A. Riddell, and Franklin Fenenga
- Collection place:
- CA-Son-299, Bodega Harbor, Sonoma County
- Collection date:
- July 14, 1949
- Museum number:
- 1-93626
- Object class:
- Hammerstones
- Collector:
- Francis A. Riddell and Richard Shutler Jr.
- Collection place:
- CA-Las-83, Lassen County, California
- Museum number:
- 2-31518
- Object class:
- Hammerstones
- Collector:
- Francis A. Riddell
- Collection place:
- NV-Wa-47, Washoe County, Nevada
- Museum number:
- 1-114957
- Object class:
- Hammerstones
- Collector:
- Francis A. Riddell and William S. Evans Jr.
- Collection place:
- CA-Las-46, Lassen County, California
- Museum number:
- 2-40718
- Object class:
- Hammerstones
- Collector:
- Francis A. Riddell
- Collection place:
- Muncy, Lycoming County, Pennsylvania
- Museum number:
- 1-115339
- Object class:
- Hammerstones
- Collector:
- Francis A. Riddell and William S. Evans Jr.
- Collection place:
- CA-Las-65, Lassen County, California
- Collection date:
- August 5, 1949