The X in Mexico : growth within tradition

Xaimaca / Ricardo Güiraldes

X [i.e. Decimo] Bienal de Sao Paulo, catalogo, [1969].

X [i.e. Décimo] aniversario de la Fundación Shell: agricultura, educación, ciencia, cultura, benéfico-social, 1959-1969

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World without borders / [by] Lester R. Brown

World who’s who in science : a biographical dictionary of notable scientists from antiquity to the present / Editor: Allen G. Debus. Associate editors: Ronald S. Calinger [and] Edward J. Collins. Managing editor: Stephen J. Kennedy

World Weather Watch : Third status report on implementation

World statistical compendium for raw hides and skins, leather and leather footwear, 1961-1982 Recueil de statistiques mondiales sur les cuirs et peaux bruts et préparés et les chaussures de cuir, 1961-1982