User talk:Hea7her/Robert Sibley Volcanic Regional Preserve/Bibliography

“Sibley Volcanic Regional Preserve.” East Bay Parks, https://www.ebparks.org/parks/sibley-volcanic.

“Sibley Regional Preserve.” Northern California Geological Society, https://www.ncgeolsoc.org/past-field-trips/sibley-regional-preserve/.

Marks, Craig RosaRobin, et al. “Exploring Sibley Volcanic Regional Preserve.” KQED, 8 July 2008, https://www.kqed.org/quest/15110/sibley-volcanic-regional-preserve-exploration.