Scientific contributions of Space Physics Group / H.S. Ahluwalia, V.I. Escobar, M. Zubieta

Scientific contribution of Space Physic Group to International Conferences / Laboratorio de física còsmica de Chacaltaya, Universidad Mayor de San Andrès, La Paz, Bolivia ; [a cura di] H.S. Ahluwalia

Nations of the modern world: Argentina / H.S. Ferns

Engineering in regional development : a study of the role the engineer in the development of the brasilian northeast / H. S. Dordick

La Argentina : Introducción histórica a sus problemas actuales / H. S. Ferns. Traducción de Fernando Lida García