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.
1988 National maternal and infant health survey.
Hyattsville: U.S.Department of Health and Human Services et al., 1998, 39 p., 0-8406-0540-4.
(1998)
1988 National maternal and infant health survey,
Hyattsville: U.S.Department of Health and Human Services et al., 39 p., 0-8406-0540-4
(1998).
1988 National maternal and infant health survey. Methods and response characteristics. Hyattsville: U.S.Department of Health and Human Services et al., 39 p..