Archival Field Letters of Paleontological Expeditions
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1902 Expedition to Montana in Search of Cretaceous Dinosaurs
1907 Expedition to Egypt in Search of Oligocene and Eocene Fossil Mammals
1909 Expedition to Montana in Search of Cretaceous Dinosaurs
1910 Expedition to Montana in Search of Creataceous Dinosaurs
1912 Expedition to New Mexico and Wyoming in Search of Eocene Fossil Mammals