| Author | Titles | | 1.
| Leith, Royal W. | 1 | | 2.
| Leithe-Jasper, Manfred | 4 | | 3.
| Leithold, Theodor von | 1 | | 4.
| Leitl, Alfons | 1 | | 5.
| Leitner, Bernhard, 1938- | 1 | | 6.
| Leitzmann, A. | 1 | | 7.
| Leixner, Otto, 1847-1907 | 1 | | 8.
| Leja, Michael, 1951- | 2 | | 9.
| Lejard, André | 2 | | 10.
| Lejarraga, Martín, 19--?- | 1 |
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