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DP13539	Twins Support Absence of Parity-Dependent Fertility Control in Pre-Transition Western European Populations Author(s): Gregory Clark, Neil Cummins and Matthew Curtis Published: February 2019
DP9116	Malthus in the Bedroom: Birth Spacing as a Preventive Check Mechanism in Pre-Modern England Author(s): Francesco Cinnirella, Marc Klemp and Jacob Weisdorf Published: September 2012

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