Chalcedony from
USA | |
| Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County |
| P. Cristofono collection, 2014 |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. Rocks & Min.: 22:209. |
| T. Mortimer, Nashua Min. Soc. Display Cat., 1995 |
| P. Cristofono collection, 2015 |
| Peter Cristofono collection, 2015 |
| Don Swenson collection |
Smith, Arthur E. (2005) New Hampshire mineral locality index. Rocks & Minerals, 80 (4) 242-261 doi:10.3200/rmin.80.4.242-261 | |
| Robert Whitmore collection |
Joppa Hill, Amherst, Hillsborough County, New Hampshire, USA