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ID Numbers
- OLID: OL10702A
- GoodReads: 243117
- ISNI: 0000000122818485
- Library of Congress Names: n50032763
- LibriVox: 3578
- MusicBrainz: ec9955c3-3d0b-44c9-909d-16c7d0395c05
- Project Gutenberg: 2037
- SBN/ICCU (National Library Service of Italy): RAVV020128
- VIAF: 73923565
- Wikidata: Q48246
- Inventaire.io: wd:Q48246
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Alternative names
- E. Haeckel
- Ernst Heinrich Philipp August Haecker
- Ernst Heinrich Philipp August Häckel
- Ernst Heinrich Phillipp August Haeckel
- Ernst Heinrich P.A . Haeckel
- Haeckel, Ernst Heinrich Philipp August, 1834-1919.
- Ernst [Heinrich Philipp August] Haeckel
- Haeckel Ernst
- Ernest Heinrich Philipp August Haeckel
- Ernst Heinrich P. Haeckel
- M. Ernst Haeckel
- Ernst Heinrich P. A. Haeckel
- Haeckel Ernst Heinrich Philipp August
- Ernst 1834-1919 Haeckel
- Ernst Haeckel
- Ernst Ernst Haeckel
- ernst haeckel
- Ernst Heinrich Philipp August Haeckel