Broline DM, Selig RA. Emigration and the “Safety-Valve” Theory in the Eighteenth Century: Some Mathematical Evidence from the Prince-Bishopric of Würzburg. ygas [Internet]. 1996 Dec. 1 [cited 2024 Jul. 22];31:137-56. Available from: https://journals.ku.edu/ygas/article/view/19175