Original: Cope sold his collections to the American Museum of Natural History in 1895 ; his set of 10,000 American fossil mammals sold for $ 32,000 , lower than Cope 's asking price of $ 50,000 .
Simplified: Cope sold fossils to museums . For example , in 1895 the American Museum of Natural History in New York City bought his collection of about 10,000 fossil mammals .