49. | | | |
50. | | | |
51. | | | |
52. | | Autor: Lord, Gail Dexter | |
53. | | Autor: U.S.Department Of, The Interior | |
54. | | Autor: U.S. Department Of, The Interior | |
55. | | Autor: Moreno, Bettencourt Fernandes | |
56. | | Autor: HonƒRio, Lívio | |
57. | | | |
58. | | Autor: Milliken, J. Gordon | |
59. | | Autor: Knetsch, Jack L. | |
60. | | Autor: Wiener, Aaron | |