511. | | Autor: Kulendran, Nada Coautor: ; Witt, Stephen F | |
512. | | Autor: Zom, Jac A. M. | |
513. | | Autor: Smith, Christine Coautor: ; Jenner, Paul | |
514. | | Autor: Barrie, Neil | |
515. | | Autor: Marvel, Macy | |
516. | | Col.autor: Travel Research International | |
517. | | Autor: Loverseed, Helga | |
518. | | Autor: Law, Rob Coautor: ; Au, Raymond | |
519. | | Autor: Stafford, Jean Coautor: ; Sarrasin, Bruno | |
520. | | Resp- Sec.: Fernández, E. Marín, J. M. Olmeda, I. Insúa, D. Ríos | |