Michigan. Board of Geological Survey Bezüge im Wissensnetz Verfasst (2) DNB-Titeldaten Report of the State Board of Geological Survey of Michigan Report on the Progress of the State Geological Survey of Michigan Creator (2) DNB-Titeldaten Report of the State Board of Geological Survey of Michigan Report on the Progress of the State Geological Survey of Michigan Administrative Überordnung der Körperschaft (1) GND-Körperschaften Michigan