@article {35, title = {Geologic Fieldtrip Guidebook database for North America}, publisher = {American Geolosciences Institute}, keywords = {educational resources, GEOLOGY, guidebooks, massachusetts}, url = {http://guide.georef.org/dbtw-wpd/guidens.htm} } @online {151, title = {Geologic Fieldtrip Guidebook database for North America - (AGI)}, publisher = {AGI}, abstract = {A thorough and searchable database to all geologic fieldtrip guidebooks published for field trips in the united states. A great resource!}, keywords = {$\#$EducationalResources, $\#$Fieldtrips, field trips, geologic, guidebooks, site, visit}, url = {http://guide.georef.org/dbtw-wpd/guidens.htm} }