Subject
- Maryland--Elk Ridge1
- McCulloh, James William, 1789–18611
- Meehan, John Silva, 1790-18631
- Memorials1
- Minerals--Analysis1
- Monuments1
- Morris, Benjamin Wistar, 1819-19061
- Mortgages1
- New Jersey Geological Survey1
- New Jersey--Atlantic City1
- New York Medical College1
- Newlyweds1
- Nickel--Metallurgy1
- Nitric acid1
- Nonmetallic minerals1
- O'Neill, Charles, 1821-18931
- Old United States Mint (San Francisco, Calif.)1
- Ontario--Caledonia Springs1
- Orchards1
- Ores1