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State Geologist and University of Michigan Regent. Personal and business correspondence and letter books concerning personal matters, his literary and book collecting interests, geology and mining in Michigan, the publication of his writings, and University of Michigan affairs.

The Hubbard papers relate to his career as a geologist, to his service as a member of the University of Michigan Board of Regents, and to his other various literary and scientific interests. The collection has been arranged into four series: Correspondence; University of Michigan papers; Other Activities (mining and geological interests); and bound personal and business records.