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- Museum number:
- 1-148469
- Object class:
- Petrified wood
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-7, Karlo area, Lassen County
- Collection date:
- 1955
- Museum number:
- 1-148484
- Object class:
- Petrified wood
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-7, Karlo area, Lassen County
- Collection date:
- 1955
- Museum number:
- 1-148466
- Object class:
- Petrified wood
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-7, Karlo area, Lassen County
- Collection date:
- 1955
- Museum number:
- 1-148496
- Object class:
- Petrified wood
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-7, Karlo area, Lassen County
- Collection date:
- 1955
- Museum number:
- 1-148271
- Object class:
- Petrified wood
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-7, Karlo area, Lassen County
- Collection date:
- 1955
- Museum number:
- 1-148274
- Object class:
- Petrified wood
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-7, Karlo area, Lassen County
- Collection date:
- 1955
- Museum number:
- 1-196794
- Object class:
- Petrified wood
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-7, Karlo area, Lassen County
- Collection date:
- 1955
- Museum number:
- 1-115482
- Object class:
- Petrified wood and Scrapers (stone tools)
- Collector:
- Francis A. Riddell and William S. Evans Jr.
- Collection place:
- CA-Las-74, Lassen County, California
- Museum number:
- 1-202845
- Object class:
- Petrified wood
- Collector:
- Francis A. Riddell
- Collection place:
- CA-Las-11, Petes Valley, Lassen County
- Collection date:
- 1941