Wojtkowski, Paul A. The theory and practice of agroforestry design a comprehensive study of the theories, concepts and conventions that underlie the successful use of agroforestry Wojtkowski, Paul A. (Paul Anthony) - U.S.A. Science Publishers,INC. 1998 - XV,282 P pc 24 ISBN: 1578080487 LC Class. No.: 634.99 CHA 2008 Dewey Class. No.: 634.99 CHA 2008