Tufa from Arizona, USA
USA | |
| Luetcke, Rolf (n.d.) Personal communication. |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
Benson, Cochise County, Arizona, USA