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Letter Z
(1979-1996)
Z39.50
Access to MEDLINE and MEDLINE Backfiles.
1995 Sep-Oct:23
ZIDOVUDINE
AZT, a new entry version.
1990 Sep-Oct:5
Clinical Alert.
1994 Mar-Apr:3
ZIP CODE, NLM.
1979 Mar:3
Zip Codes.
changed for NLM and NIH.
1985 Aug:3
SDILINE availability for U.S.
1985 Apr:3
ZN (Mesh Z Tree Number for Country of Publication)
Changes for 1991.
1991 Sep-Oct:Appendix D
Year-End Processing
1991 Sep-Oct:11
ZN (Country of Publication) Field Changes.
1992 Nov-Dec:23
ZN (MeSH Z Tree Number) Field Replaced.
1993 Sept-Oct:13,18