The mystery of time : humanity's quest for order and measure / John Langone. Langone, John. 1929-2006. Time History. BD638 .L26 2000 115 21 LAM Includes bibliographical references and index. Washington, D.C. : National Geographic Society, c2000. c2000. 2000 Text 256 p. : http://www.loc.gov/catdir/description/simon032/00041812.html eng