Ernst Heinrich Philipp August Haeckel
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Ernst Heinrich Philipp August Haeckel,
2004
.
Olaf Breidbach,
I. Eibl-Eibesfeldt,
Ernst Haeckel,
1998
.
Ernst Haeckel,
Ernst Heinrich Philipp August Haeckel,
2004
.
Thomas Henry Huxley,
T. Huxley,
Ernst Haeckel,
2004
.