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These stamps are listed in a specialized catalog of Spanish Civil War stamps known as the Sofima Catalog. The complete title is "Catalogo de los Sellos Locales Emitidos Durante la Guerra Civil Espanola 1936- 1939", published in 1995 by FESOFI. They are listed in that catalog as #33-35.
They are also listed as #340-342 in a catalog called the Guillamon Catalog published in 1977. The complete title of this catalog and the name of the publisher are unknown at the present time.
Last updated: September 10, 2002