81. Skiascopy: a treatise on the shadow test in its practical application to the work of refraction : with an explanation in detail of the optical principles on which the science is based Publication: Philadelphia, Pa., U.S.A. : Published by The Keystone, 1899 Subject(s): RetinoscopyOptical Phenomena
82. El Dispensario no. 2 de la "Sociedad Protectora de la Infancia": estudio sobre la estadística de 1914 : comunicación presentada al I Congreso Médico Ecuatoriano Author(s): Domingo Escolar, José, author Publication: Guayaquil : Libreria e Imprenta la Reforma, 1915 Subject(s): Infant MortalityChild Health ServicesChild MortalityEcuadorSociedad Protectora de la Infancia (Guayaquil, Ecuador)
83. The Pan American maritime sanitary code: a handbook for delegates to the Seventh Pan American Sanitary Conference, Havana, Cuba, November 5 to 15, 1924 Publication: Washington, D.C. : The Pan American Sanitary Bureau, 1924 Subject(s): Sanitation -- legislation & jurisprudenceNaval Medicine -- legislation & jurisprudenceAmericasPan American Sanitary Conference