Population studies and the Old Order Amish.
D000017:ABO Blood-Group System; D003241:Consanguinity; D005260:Female; D005808:Genes, Recessive; D005828:Genetics, Population; D006801:Humans; D007196:Indiana; D008136:Longevity; D008297:Male; D009820:Ohio; D010414:Pennsylvania; D011157:Population Dynamics; D012067:Religion; D012424:Rural Population
D000017:ABO Blood-Group System