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Authors
- Laennec, R. T. H. (René Théophile Hyacinthe), 1781-18261
- Landes, Leonard, 1870- author1
- Landis, Henry G. (Henry Gardner), 1848-18862
- Landois, L. (Leonard), 1837-1902 author1
- Landrum & Litchfield.1
- Langdon, Frank Warren, 1852-19331
- Langley, S. P. (Samuel Pierpont), 1834-1906 author1
- Lawson, John D. (John Davison), 1852-1921 author1
- Lazell, Marsh & Gardiner.1
- Lea, Henry Charles, 1825-19091
- Lee, Robert, 1793-18771
- Leffmann, Henry, 1847-19302
- Leffmann, Henry, 1847-1930 author2
- Leidy, Joseph, 1823-18911
- Leitch, Margaret W., author1
- Leitch, Mary, author1
- Lenhart, C. H. (Carl Henri), 1880-1955, author1
- Leonard, C. Henri (Charles Henri), 1850-19251
- Leonard, L. W. (Levi Washburn), 1790?-18641
- Leonard, W. E. (William Edwin), 1855-1935 author1