Rock Crystal from
Norway | |
| Anonymous: (1983): Jensen-skjerpene ( P4-16). DG-nytt [A local magazine for the Drammen geological society, Norway] nr 5, 1983, p.14. |
| Anonymous: (1983): Hørtekollen flusspatgruve (D5-01). DG-nytt [A local magazine for the Drammen geological society, Norway] nr 9, desember 1983, p.13. |