Subject
- Limestone2
- Louis XIV, King of France, 1638-17152
- Maier, Michael, 1568?-16222
- Marble2
- Marine algae2
- Mauve2
- Mercury2
- Merian, M.2
- Microscope slides2
- Military architecture--Designs and plans2
- Mites2
- Montgolfier, Jacques-Etienne, 1745-17992
- Moon2
- Moths2
- Norton, Thomas2
- Oil fields2
- Optical instruments2
- Oxygen2
- Palms2
- Pennsylvania--Oil Creek (Crawford County and Venango County)2