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Collection place
- California146
- North America146
- The Americas146
- United States146
- Northern California141
- Colusa County, California73
- North Central California73
- CA-Col-1 (Miller Mound), Colusa County, California68
- Northwestern California60
- Humboldt County, California56
- Humboldt Bay, Humboldt County, California48
- South Spit, Humboldt Bay, Humboldt County40
- CA-Hum-112, Humboldt County, California38
- CA-Hum-68, Humboldt County, California8
- CA-Sha-47 (Redding Mound #1), Redding, Shasta County8
- Gunther Island, Humboldt Bay, Humboldt County8
- Northeastern California8
- Redding, Shasta County, California8
- Shasta County, California8
- near Redding, Shasta County, California8