Census tract certainty 1970&80&90:Type:Pt:Census tract:Nom:*
census tract certainty 1970&80&90:type:pt:census tract:nom:*
Census tract certainty 1970&80&90:Type:To identify measures at a point in time:Census tract:Nominal:*
census tract certainty 1970&80&90:type:to identify measures at a point in time:census tract:nominal:*