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Book summary

Serendipity:

• The Cohort Approach: Essays in the Measurement of Temporal Variations in Demographic Behavior by Norman B. Ryder (9780405129919)
• Galois Theory, Hopf Algebras, And Semiabelian Categories by Bodo Pareigis (9780821832905)
• Juegos, Fiestas Y Diversiones: Textos Historicos by Spain (9788489763562)