 Cope sold his collection of fossils to the American Museum of Natural History (AMNH) in 1895.Shortly before his death in 1897, he worked with the museum's artist Charles R. Knight to produce illustrations and paintings depicting some of his species in life, including "Amphicoelias".Based on notes accompanying his sketches provided to Knight as reference material, Cope evidently considered both "Amphicoelias" and "Brontosaurus" junior synonyms of "Camarasaurus supremus" at this time.