/*
    Many-to-one merge on specified key variables
*/

/* Describe the individual datasets */
desc using merged-md-dc-va
desc using countybirths

use merged-md-dc-va, clear
desc
merge m:1 statename countyname using countybirths
keep if _merge==3
drop _merge

/* Examine the merge outcome */
desc
list statename countyname pop00 pop01 births4_7_00 births01, clean noobs

/* Save the file */
save merged-births-deaths, replace