TILL Geoffrey Seapower : a guide for the twenty-first century / Geoffrey Till. - 3rd ed. - New York : Routledge , 2013. - xvii, 412 pages : illustration , maps ; 25 cm. Revised and updated third edition. Includes bibliographical references and index. ISBN: 9780415622622 (pbk.) : GBP32.99 Subjects--Topical Terms: NAVAL STRATEGYSEA POWER