MMWR Surveillance Summary: Past Volume (1989)
The CDC Surveillance Summaries provide a means for CDC programs to disseminate surveillance findings, permitting detailed interpretation of trends and patterns based on those findings.
December 1, 1989 / Vol. 38 / No. SS-3
September 1, 1989 / Vol. 38 / No. SS-2
August 1, 1989 / Vol. 38 / No. SS-1