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- Museum number:
- 1-99812
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-29, Honey Lake Valley, Lassen County
- Museum number:
- 1-128935
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Adán Eduardo Treganza, Dorothy Menzel, and Francis A. Riddell
- Collection place:
- CA-Sta-44 (Farmington site), Stanislaus County, California
- Collection date:
- May 12, 1951
- Museum number:
- 1-106911
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Arnold R. Pilling, Francis A. Riddell, and Franklin Fenenga
- Collection place:
- CA-Son-299, Bodega Harbor, Sonoma County
- Collection date:
- July 3, 1949
- Museum number:
- 1-100337
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Francis A. Riddell and Franklin Fenenga
- Collection place:
- CA-Fre-29, Fresno County, California
- Collection date:
- Summer 1948
- Museum number:
- 1-202044
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-33, Long Valley, Lassen County
- Collection date:
- July 1951
- Museum number:
- 1-115412
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Francis A. Riddell and William S. Evans Jr.
- Collection place:
- CA-Las-69, Secret Valley, Lassen County
- Collection date:
- August 8, 1949
- Museum number:
- 1-99816
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-29, Honey Lake Valley, Lassen County
- Museum number:
- 1-109772
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Arnold R. Pilling, Francis A. Riddell, and Franklin Fenenga
- Collection place:
- CA-Son-299, Bodega Harbor, Sonoma County
- Collection date:
- July 25, 1949
- Museum number:
- 1-115282
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Francis A. Riddell and William S. Evans Jr.
- Collection place:
- CA-Las-56, Lassen County, California
- Museum number:
- 1-116369
- Object class:
- Choppers (prehistoric cutting tools)
- Collector:
- Arnold R. Pilling, Francis A. Riddell, and Franklin Fenenga
- Collection place:
- CA-Son-322, Bodega Harbor, Sonoma County