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  1. 1
    Published 1926
    México, D.F., 1926.
    98, 50 pages, 2 leaves including tables 7 diagrams 23 cm.
  2. 2
    Published 1976
    [México] : Secretaria de la Presidencia, Dirección General de Documentación e Informe Presidencial, [1976]
    1 online resource (246 pages)
    Center for Research Libraries.
    Online Resource

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