Seasonality of conception in Hutterite colonies of Europe (1758-1881) and North America (1858-1964).
D004641:Emigration and Immigration / Q000266:history; D005060:Europe; D005306:Fertilization; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D009656:North America; D012067:Religion / Q000266:history; D012621:Seasons; D014455:Ukraine