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Catholic Church. Pope (1878-1903 : Leo XIII) -- See Also Leo XIII, Pope, 1810-1903
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Catholic Church. Pope (1878-1903 : Leo XIII). Aeterni Patris. / https://id.loc.gov/authorities/names/n82165944 : MacIntyre, Alasdair C.
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1990
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Enciclica Rerum novarum -- See Rerum novarum
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