TY - JOUR A1 - Johow, J. A1 - Voland, E. T1 - Conditional grandmother effects on age at marriage, age at first birth, and completed fertility of daughters and daughters-in-law in historical Krummhörn Y1 - 2012 DO - 10.1007/s12110-012-9147-7 JF - Human Nature VL - 23 IS - 3 ER -