First marriages: United States, 1968 - 1976.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008393:Marriage; D008875:Middle Aged; D012111:Residence Characteristics; D012621:Seasons; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014481:United States