Towards the end of the nineteenth century:
a rapid break-through in birth-spacing
in the Westgerman village of Höringhausen

Piles: 1 = families with birth intervals -18 months;
2 = 19-30 months; 3 = 31-48 months; 4 = 49- months

Source: CD-ROM Historische Demographie I, 1995, Fig. 11 (with explanations in German).