001(1stEdition) Superstring Theory: Volume 1, Introduction (Cambridge Monographs on Mathematical Physics) by Michael B. Green, Edward Witten, John H. Schwarz, Green/Schwarz/Witten Paperback, 484 Pages, Published 1988 by Cambridge University Press ISBN-13: 978-0-521-35752-4, ISBN: 0-521-35752-7
"In recent years, superstring theory has emerged as a promising approach to reconciling general relativity with quantum mechanics and unifying the fundamental interactions. Problems that have seemed insuperable in previous approaches take on a totally new character in the context of superstring theory, and some of them have been overcome. Interest in the subject has greatly increased following a succession of exciting recent developments ..."
Superstring Theory(1stEdition) Volume 2, Loop Amplitudes, Anomalies and Phenomenology (Cambridge Monographs on Mathematical Physics) by Michael B. Green, John H. Schwarz, Edward Witten Paperback, 614 Pages, Published 1988 by Cambridge University Press ISBN-13: 978-0-521-35753-1, ISBN: 0-521-35753-5
"366pp. DJ: Very Good-w/ a 2 inch closed tear & a 3 inch closed tear, minute edge/corner wears. Protected w/ clear plastic cover. The Book: Very Good+++."