
Gum card entitled "Women militia fighters in Spain". From the series "To know the horrors of war is to want peace." Produced by Gum.Inc in Philadelphia, 1938.
There are numerous books in Spanish on the role of women but relatively few in English
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Defying Male Civilization: Women in the Spanish Civil War by Mary Nash. This essential text is not cheap, though you can read sections on Google Books.
Into the Fire: American Women in the Spanish Civil War (2002) Don’t know if this film is available online.