Ward, Peter Douglas <br/><br/>On methuselah's trail:  living fossils and the great extinctions/ Peter Douglas Ward.--  -- New York:  W.H. Freeman and Company,  1992. <br/>xii.,  ill.;  23. <br/><br/> Includes index. <br/><br/><label>ISBN: </label>071672488X <br/><br/><label>Subjects--Topical Terms: </label><br/>Living fossils<br/>Extinction (Biology)<br/><br/><label>Dewey Class. No.: </label>HS Cir 591.3 W21 1992