Bakker, Robert T. frey50 Dactyls! : dragons of the air / by Robert T. Bakker ; illustrated by Luis V. Rey. - New York : Random House, c2005. - 48 p. : col. ill. ; 23 cm. - Step into reading. Step 4 . - . ISBN: 0375830138 (trade paper) 9780375830136 (trade paper) 0375930132 (lib. bdg.) 9780375930133 (lib. bdg.) LCCN: 2004007482 Subjects--Topical Terms: Pterodactyls Dewey Class. No.: j567.918 Bak 25