| Natural History Museum of Belgium (1947) to Mrs. Racovitza, widow of Emil Racovitza (Racovita)" | ||
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| Letter to Franz Unger (Bavaria, 1845) | Reply card of Zoological Museum of Berlin (1912) | |
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| Alexander Nasmyth to William Buckland (1838)
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Invitation of the British Association for the Advancement of Science to meeting in Glasgow (1876) | Richard Owen to Sir Henry Barkly (1876)
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| Paleontological school of University of Roam, Italy (1933) | ||
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| University Zaragoza, Department of Paleontology | ||
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| Erasmus Crawford to Othniel Marsh (1870),
Yale College, New Jersey
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Museum of Paleontology, Berkeley (1935) to Professor Stehlin, NHM Basle in Switzerland | The Paleontological Society, Princeton, New Jersey (1936) to Dr. Rudolf Richter (Germany) |
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