511. | | Autor: Trew, Jill | |
512. | | Autor: Meldrum, Andrew | |
513. | | Autor: Marques, Marina | |
514. | | Autor: Godin, Pierre | |
515. | | Autor: Freitag, Rolf D. Co col. autor sec.: ; European Travel Monitor | |
516. | | Autor: Carvalho, Emanuel | |
517. | | Autor: Jones, Clive B. | |
518. | | Autor: Coleman, Robert J. | |
519. | | Autor: Farrell, Derek H. | |
520. | | Autor: Wilson, J. F. B. | |