Research

Catalog of censor marks used in the Republican prisons and labor camps during the Spanish civil war
This compendium contains all known marks used by censorship on covers and postcards coming from or going to prisons, prison ships, checkas and labor camps.
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Chronology of the labor camps
As the correspondence rarely mentions where it was written, we must rely on the recorded dates of foundation and movement of the camps to know from where covers and postcards were sent, as the camps had several locations, depending on the advance of the war front.
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The postal restrictions and conditions in the labor camps
The prisoners in labor camps and other S.I.M. prisons had limits to send mail, and even on the length of the text they could write or receive.
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Rarity
We only know 67 pieces from or to the S.I.M.’s prisons and labor camps, but, despite having them listed in our catalog, we cannot guarantee that all of them still exist.
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Bibliography
You will find all the literature used in this website in the list in this section.
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