Input (grade 13): 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.
Output (grade 9): 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.