Hague, Bradley. Alien deep : revealing the mysterious living world at the bottom of the ocean / by Bradley Hague. - Washington, D.C. : National Geographic, c2012. - 48 p. : col. ill. ; 27 cm. Includes bibliographical references and index. ISBN: 9781426310676 (hardcover : alk. paper) 9781426310683 (library binding : alk. paper) LCCN: 2012012939 Subjects--Topical Terms: Hydrothermal vent animals.Hydrothermal vent ecology.Hydrothermal vents. LC Class. No.: GB1198 / .H34 2012 Dewey Class. No.: 551.2/3