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Author(s): Blanco, T. Title: Estudio comparativo de las escalas de optotipos. Subject(s): Test-types Journal Title Abbreviation: Arch. de oftal. Hispano-Am. Place of Publication: Barcel. Date of Publication: 1907 Pagination: viii, 492–503. Language: Spanish Type of Resource: Analytic Series/Volume/Page: Series 2/Volume 17/Page 786 - 21707861380
Author(s): Blanco, T. Title: Nueva escala universal de optotipos. Subject(s): Test-types Journal Title Abbreviation: Arch. de oftal. Hispano-Am. Place of Publication: Barcel. Date of Publication: 1909 Pagination: ix, 273–278. Language: Spanish Type of Resource: Analytic Series/Volume/Page: Series 2/Volume 17/Page 786 - 21707861420
Author(s): de las Cuevas y Pulido, J. Title: Nécessité de l'unification des échelles optométriques. [Rap.] Subject(s): Test-types Journal Title Abbreviation: Cong. internat. de méd. C.-r. 1903 Place of Publication: Madrid Date of Publication: 1904 Pagination: xiv, sect. d'opht., 113–139. Language: Spanish Type of Resource: Analytic Series/Volume/Page: Series 2/Volume 17/Page 786 - 21707861490
Author(s): González, J. de J. Title: Breve nota acerca de la visibilidad relativa de las letras escritas con tinta, con lápiz y con pizarrin. Subject(s): Test-types Journal Title Abbreviation: An. de oftal. Place of Publication: México Date of Publication: 1910–11 Pagination: xiii, 195–200. Language: Spanish Type of Resource: Analytic Series/Volume/Page: Series 2/Volume 17/Page 786 - 21707861580
Author(s): Landolt, E. Title: Nécessité de l'unification des échelles optométriques. [Rap.] Subject(s): Test-types Journal Title Abbreviation: Cong. internat. de méd. C.-r. 1903 Place of Publication: Madrid Date of Publication: 1904 Pagination: xiv, sect. d'opht., 97–112. Language: Spanish Type of Resource: Analytic Series/Volume/Page: Series 2/Volume 17/Page 786