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- Mandibular Fractures -- therapy1
- Massachusetts3
- Maxillary Fractures -- therapy1
- Meat1
- Medicine1
- Meissner, Georg, 1829-1905.1
- Metamorphosis, Biological -- physiology1
- Metric System2
- Michigan1
- Microbiota -- physiology1
- Military Medicine1
- Military Medicine -- history1
- Military Personnel4
- Military Science1
- Mineral Waters -- analysis1
- Mineral Waters -- therapeutic use1
- Mining1
- Mississippi8
- Morton, W. T. G. (William Thomas Green), 1819-1868.3
- Murphy, J. B. (John Benjamin), 1857-1916.1