- Homann, Johann Baptist, 1663-17243
- Hôtel Karersee3
- International Joint Commission3
- Irvine, William, 1741-18043
- Jentzsch, Alfred, 1850-19253
- Johnston, Alexander Keith, 1804-18713
- Lamb, George3
- Leith, C. K. (Charles Kenneth), 1875-19563
- Lizars, Daniel, 1760-18123
- Lobeck, A. K. (Armin Kohl), 1886-19583
- Longman, Rees, Orme, Brown, and Green3
- Lucas, Fielding, Jr., 1781-18543
- Lusardi, Barbara A3
- Lynch, F. C. C. (Francis Christopher Chisholm), 1884-3
- Machamer, J.F.3
- Maryland Geological Survey3
- Matthews-Northrup Company3
- Matthews-Northrup Works3
- Meyer, G.N3
- Minnesota Transfer Board of Trade.3