BOLETÍN DEL PROGRAMA SOBRE EL HOMBRE Y LA BIOSFERA: Segundo Congreso Internacional sobre Tierras de Pastoreo. / 28 'aprovech':18 'biocuat':21 'biospher':39 'boletin':24 'circumpolar':3 'donan':32 'educacion':16 'establec':4 'exposicion':9 'grest':36 'gui':33 'history':41 'hombr':46 'mab':11 'mexic':23 'montains':38 'mund':49 'nacional':30 'nuev':8 'of':42 'pais':2 'parqu':29 'percepcion':27 'problem':14 'profesor':35 'recurs':20 'red':6 'reservr':40 'rus':13 'scientific':43 'smok':37 'study':44

Material type: ArticleArticle In: La naturaleza y sus recursos
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