| Name | Info | Provider | Link |
|---|---|---|---|
| Volcanoes | free resource | MedlinePlus Health Information | https://medlineplus.gov/volcanoes.html |
| subscription/membership/fee required | Nature Publishing Group | https://doi.org/10.1038/nature05227 | |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=17051217.ui | |
| SILVA SSU Database | free resource | SILVA | http://www.arb-silva.de/search/show/ssu/pubid/17051217 |