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  1. By: Sierra, J. M. Romero. - Universidad Central De Venezuela. - London School of Hygiene and Tropical Medicine.
    Publication info: Caracas : Herrera Irigoyen, 1907.
    Holding Institution: London School of Hygiene & Tropical Medicine Library & Archives Service (archive.org)
  2. By: Sierra, J. M. Romero. - London School of Hygiene and Tropical Medicine.
    Publication info: Caracas : Guttenberg, 1911.
    Holding Institution: London School of Hygiene & Tropical Medicine Library & Archives Service (archive.org)
    BHL Collections: Publicaciones en Español