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Authors
- Haden, Russell Landram, 1888-1952 author1
- Hadfield, J. A. (James Arthur), 1882-19671
- Hadol, Paul, 1835-1875 artist1
- Hadra, B. E. (Berthold Ernest), 1842-19031
- Hadra, B. E. (Berthold Ernest), 1842-1903 author1
- Haeckel, Ernst, 1834-19191
- Haeckel, Ernst, 1834-1919 author2
- Haeckel, Ernst, 1834-1919, author2
- Haensel, Vladimir, 1914- author1
- Haferkorn, Henry Ernest, 1859-1933 compiler1
- Haffajee, Rebecca L, author1
- Haffajee, Rebecca L., author1
- Hagen, Carl.1
- Hagen, Friedrich Wilhelm, 1814-18881
- Hagen, Hermann August, 1817-1893 author1
- Hagen, Richard, 1823-19081
- Hagner, D. R. (Daniel R.)1
- Hagner, Francis R. (Francis Randall), 1873-19401
- Hague, A. (Arnold), 1840-1917 author1
- Hahn, John.1