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2. In the Vale of Tears
3. Fitzpatrick, Sheila. The Commissariat of Enlightenment: Soviet Organization of Education and the Arts Under Lunacharsky, October 1917-1921. Cambridge: Cambridge University Press, 1970.
4. Kautsky, Karl. Die Sozialdemokratie und die katholische Kirche. Berlin: n.p. 1903.
5. Kautsky ,Foundations of Christianity, trans. H. F. Mins. London: Socialist Resistance, [1908] 2007.