Subjects: work
- Mesa Verde National Park (Colo.) -- Pictorial works
- Metallurgy -- Early works to 1800
- Metal-work
- Metal-work -- Collectors and collecting
- Metaphysics -- Early works to 1800
- Meteorology -- Early works to 1800
- Mexico -- Description and travel -- Early works to 1800
- Microscopy -- Early works to 1800
- Middle East -- Description and travel -- Early works to 1800
- Midwifery -- Early works to 1800
- Midwifery -- England -- Early works to 1800
- Midwifery -- Popular Works
- Military art and science -- China -- Early works to 1800
- Military art and science -- Early works to 1800
- Military art and science -- Greece -- Early works to 1800
- Military art and science -- Rome -- Early works to 1800
- Milk -- Diet therapy -- Early works to 1800
- Mills and mill-work -- Equipment and supplies -- Catalogs
- Mills and mill-work -- Fiction
- Mills and mill-work -- Juvenile fiction
- Mills and mill-work -- Management -- Drama
- Mind and body -- Early works to 1800
- Mine pumps -- Early works to 1800
- Mineral industries -- Early works to 1800
- Mineralogical chemistry -- Early works to 1800
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