| Millsaps College |
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| Milner Library, Illinois State University |
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| Milwaukee County Federated Library System |
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| Minitex |
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| Minitex at the University of Minnesota Libraries |
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| Minneapolis College of Art and Design |
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| Minneapolis Institute of Arts |
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| Minnesota Historical Society |
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| Minnesota Military Museum |
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| Minnesota State University, Mankato |
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| Mint Museum of Art |
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| Mississippi Department of Archives and History |
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| Mississippi State University |
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| Mississippi State University Libraries |
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| Missoula Public Library |
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| Missouri Historical Society |
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| Missouri History Museum |
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| Missouri Southern State University |
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| Missouri State University |
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| Missouri University of Science and Technology |
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| MIT Center for Civic Media |
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| MIT Libraries |
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| MIT Libraries, Insitute Archives and Special Collections |
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| MIT Lincoln Laboratory |
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| MITRE |
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