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My really big recommendation, though is The Cypresses Believe in God by José Maria Gironella, which I am just now reading for a second time.
It covers 1931-1936, covering the chaos (there's that word again) of the pre-war period as it caught up one family in Gerona, a provincial capital in Catalonia. It really illuminates the complexities of the human conflict, and gives --- it seems to me --- a sympathetic and balanced glimpse of all the bewildering multiplicity of factions, anacharist, Catholic, communist, royalist, traditionalist, socialist, liberal, Catalan-nationalist, and more.
Published by Ignatius Press, 800+ pages (and it's just the first of a trilogy!) , can be gotten, used, for under $10 from Amazon.
I think it's tremendous, and really want to read the 2nd and 3rd installments.
Leaves you shaking your head over tormented Spain--- and the tormented human race.