@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}
}
