On the relations of the Niagara and Lower Helderberg formations, and their geographical distributions in the United States and Canada

Revision	When	Who	Comment

3	August 2, 2012	VacuumBot	Updated format '[microform] /' to 'Microform'
2	December 15, 2009	WorkBot	link works
1	September 26, 2008	ImportBot	Imported from Oregon Libraries MARC record.