 | La Hue, D. W. (Delmon William), 1911- 4n | (2) |
| LaFerney, Preston Edward, 1935- 2n | (3) |
| Lake States Forest Tree Improvement Conference (10th : 1971 : Madison, Wis.) mn | (1) |
| Lamb, Fred M. cn | (1) |
| Landis, B. J. (Birely J.), 1904- 4n | (1) |
| Lanner, Ronald M. cn | (1) |
| LaPage, Wilbur F. cn | (1) |
| Large, Hollis R. | (1) |
| Larkin, L. C. (Lawrence Clark), 1916- 4n | (1) |
| Larsen, John T. 4n | (1) |
| Larsen, Marion R. (Marion Rosslyn), 1914- 4n | (2) |
| Larson, Donald K. 1n | (1) |
| Larson, M. M. (Merlyn Milfred), | (1) |
| Larson, Robert W. 4n | (1) |
| Larson, Wayne L. 1n | (2) |
| Lasley, Floyd Alvin, 1925- 2n | (1) |
| Lauritzen, C. W. (Cyril Walker), 1905- 4n | (1) |
| Lauritzen, C. W. (Cyril Walker), 1905- cn | (1) |
| Lea, Dallas M. 4n | (1) |
| Leaf, Charles F. | (1) |
| Leak, William B. cn | (1) |
| Leary, Rolfe A. cn | (1) |
| Leath, Mack N. 1n | (1) |
| Lee, Robert E. (Robert Edwin), 1911- 4n | (1) |
| Lee, W. O. (William O.), 1911- 4n | (1) |
| Leiserson, Etty. 4n | (1) |
| Leithead, Horace L., 1915- 4n | (1) |
| Leonard, Clarence G. (Clarence Gillette), 1920- 4n | (1) |
| Leonard, Olen E. (Olen Earl), 1909- 4n | (1) |
| Leopold, N. F. | (1) |
| Leuschner, William A. cn | (1) |
| Leuthold, Frank O. (Frank Oscar), | (2) |
| Leuthold, Raymond M. | (1) |
| Levine, Jerome A. 4n | (1) |
| Lewis, Franklin B. cn | (1) |
| Lewis, Gordon D. | (1) |
| Lienk, S. E. (Siegfried Eric), | (1) |
| Lillie, Robert J. (Robert Jones), 1921- 4n | (1) |
| Lime, David W. cn | (1) |
| Lindstrom, D. E. (David Edgar), 1899- 4n | (1) |
| Lipton, Werner J., 1928- 1n | (2) |
| Little, Elbert Luther, 1907- 2n | (3) |
| Little, Silas. cn | (2) |
| Littleton, Isaac Thomas, | (1) |
| Litton, R. Burton. cn | (1) |
| Livingston, A. L. (Arvin L.), 1923- 4n | (1) |
| Lockner, Allyn O. 4n | (1) |
| Loegering, W. Q. (William Quenn), 1912- 4n | (1) |
| Logan, William J. C., 1933- 4n | (1) |
| Long, Mary E. (Mary Ellen), 1913- 4n | (1) |
| Longwell, John Harwood, | (1) |
| Looney, Zolon Marion, 1916- 2n | (1) |
| Lopes, James. 4n | (1) |
| Lotan, James E. | (1) |
| Lucas, John T. | (1) |
| Luke, George W. 4n | (1) |
| Lull, Howard William, 1915- dn | (2) |
| Lund, Lois A. 4n | (1) |
| Lundgren, Allen L. cn | (4) |
| Lundquist, Arnold L. (Arnold Leroy), 1912- 4n | (1) |
| Lundquist, Dorothy M., 1911- 4n | (2) |
| Lynam, John. 4n | (2) |
| Lynch, John V. (John Vincent), 1934- 4n | (1) |
| Lyons, A. J., 1932- 4n | (1) |
| Lysons, Hilton H. cn | (1) |