Describes what is known about three different types of dinosaurs that lived in parts of the United States and Canada from 140 to 65 million years ago.
- ISBN10 051635289X
- ISBN13 9780516352893
- Publish Date 12 December 1931
- Publish Status Out of Print
- Out of Print 1 September 2015
- Publish Country US
- Imprint Capstone
- Format Hardcover
- Pages 48
- Language English