2013 - Time Travel and Warp Drives a Scientific Guide to Shortcuts Through Time and Space (Paperback) → Hardcover ISBN-13: 9780226045481 ISBN-10: 022604548X Genre: Science & Math ? 2011 - Time Travel and Warp Drives a Scientific Guide to Shortcuts Through Time and Space (Hardcover) → Paperback ISBN-13: 9780226224985 ISBN-10: 0226224988 Genre: Science & Math ? |