1. Perforator Museum number: 1-196141 Object class: Perforators Collector: Francis A. Riddell Collection place: CA-Las-7, Karlo area, Lassen County Collection date: 1955
2. Perforator Museum number: 1-145338 Object class: Perforators Collector: Francis A. Riddell and James Francis Riddell Collection place: CA-Las-7, Karlo area, Lassen County Collection date: November 26-28, 1954
3. Perforator Museum number: 1-145335 Object class: Perforators Collector: Francis A. Riddell and James Francis Riddell Collection place: CA-Las-7, Karlo area, Lassen County Collection date: November 26-28, 1954
4. Perforator Museum number: 1-196154 Object class: Perforators Collector: Francis A. Riddell Collection place: CA-Las-7, Karlo area, Lassen County Collection date: 1955
5. Perforator Museum number: 1-145336 Object class: Perforators Collector: Francis A. Riddell and James Francis Riddell Collection place: CA-Las-7, Karlo area, Lassen County Collection date: November 26-28, 1954
6. Perforator Museum number: 1-101419 Object class: Perforators Collector: Francis A. Riddell and Franklin Fenenga Collection place: CA-Las-1, Lassen County, California Collection date: February 1949
7. Perforator Museum number: 1-196140 Object class: Perforators Collector: Francis A. Riddell Collection place: CA-Las-7, Karlo area, Lassen County Collection date: 1955
8. Perforator Museum number: 1-145337 Object class: Perforators Collector: Francis A. Riddell and James Francis Riddell Collection place: CA-Las-7, Karlo area, Lassen County Collection date: November 26-28, 1954
9. Perforator Museum number: 1-145392 Object class: Perforators Collector: Francis A. Riddell and James Francis Riddell Collection place: CA-Las-7, Karlo area, Lassen County Collection date: November 26-28, 1954
10. Perforator Museum number: 1-196161 Object class: Perforators Collector: Francis A. Riddell Collection place: CA-Las-7, Karlo area, Lassen County Collection date: 1955