- Keller, Heinrich, 1778-1862, cartographer1
- Kenyon Company (Des Moines, Iowa)1
- Kip, William, engraver1
- Kümmerly + Frey1
- L'Isle, Guillaume de, 1675-1726, cartographer1
- L. Jancourt (Firm)1
- L.L. Poates Engr'g Co., cartographer, engraver1
- Le Rouge, Georges-Louis, cartographer1
- Lenhard, J.1
- Leppard, Henry M. (Henry Milton), 1886-1
- Lovell Johns Ltd. cartographer1
- MacCoun, Townsend, 1845-1932, cartographer1
- Malaroda, Roberto1
- Malkin, A.1
- Matthews-Northrup Company1
- Matthews-Northrup Works1
- McKinley Publishing Company, cartographer, publisher1
- Medina, Pedro de, 1493?-1567?, author1
- Miller, Herbert Adolphus, 1875-19511
- Morden, Robert, approximately 1650-1703, cartographer1
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