Letter X
(1997-Present)

Year 2000 Compliance. 1998 Sep-Oct:e5

NLM Databases. 1997 May-Jun:2

Dates in Citations. 1997 May-Jun:2

Class Update Date (CU) Field Expanded to Four Digits. 1997 Sep-Oct:1

Date of Entry (DA) Field Expanded to Eight Digits. 1997 Sep-Oct:1

Entry Month (EM) Field Expanded to Six Digits. 1997 Sep-Oct:1

Last Revision Date (LR) Field Expanded to Eight Digits. 1997 Sep-Oct:1

Year (YR) Field Expanded to Four Digits. 1997 Sep-Oct:1

Year-End Processing

1997. 1997 Sep-Oct:1

1998. 1998 Sep-Oct:e2

1999. 1999 Nov-Dec:e2

2000. 2001 Jan-Feb:e2

2001. 2001 Nov-Dec:e2; 2001 Nov-Dec:e11

2002. 2002 Sep-Oct:e7; 2002 Nov-Dec:e4

2003. 2003 Sep-Oct:e7; 2003 Nov-Dec:e6

2004. 2004 Sep-Oct:e4; 2004 Nov-Dec:e9

2005. 2005 Sep-Oct:e4; 2005 Nov-Dec:e7

2006. 2006 Sep-Oct:e9; 2006 Nov-Dec:e3

2007. 2007 Sep-Oct:e10; 2007 Nov-Dec:e6

2008. 2007 Nov-Dec:e1

2009. 2008 Sep-Oct:e7; 2008 Nov-Dec:e20

2010. 2009 Sep-Oct:e3; 2009 Nov-Dec:e13

2011. 2010 Sep-Oct:e1

2012. 2011 Sep-Oct:e1; 2011 Nov-Dec:e13;