- Layzer, Jean, author5
- Lewis, William, 1708-17815
- Library of Congress. Legislative Reference Service, compiler, issuing body.5
- Lynch, Charles, 1868-1937, author5
- Lyons, Barbara, author5
- MacKinney, A. Clinton, author5
- Marks, A. A. (Amasa Abraham)5
- Mastin, Claudius H. (Claudius Henry), 1826-1898, author5
- Mattison, J. B., author5
- Mattson, M. (Morris), 1809?-18855
- May, Kendra, author5
- McCarthy, Charles L., author5
- McElroy, Z. Collins, author5
- McKesson and Robbins, Inc.5
- McMorrow, Stacey, author5
- Meigs, James Aitken, 1829-18795
- Milne-Edwards, H. (Henri), 1800-18855
- Mitchill, Samuel L. (Samuel Latham), 1764-18315
- Morton, Thomas G. (Thomas George), 1835-19035
- Morton, W. T. G. (William Thomas Green), 1819-18685