The Canadian National Parks : today and tomorrow. Conference II : ten years later Author(s) Nelson, James Gordon Needham, R. D. Nelson, S. H. Scace, R. C. (Robert C.)
The Canadian National Parks : today and tomorrow Author(s) Nelson, James Gordon Scace, R. C. (Robert C.)
Prime osservazioni sulla biologia del Gracchio corallino nel Parco Nazional d'Abruzzo Author(s) Lovari, Sandro
Le parc national de la Comoe : essai de zoogéographie d'un milieu naturel protégé Author(s) Lauginie, Francis Sournia, Gérard
