Description
Published:Began with Edition 39 (spring 2007).
Item Description:Description based onfirst issue; title from title screen (viewed June 4, 2008).
Latest issue consulted: Edition 43 (spring 2008).
Electronic resource.
Physical Description:volumes : digital, PDF file.
Publication Frequency:Quarterly
Format:Mode of access: Internet via the EPA STL Program web site. Address as of 06/04/08: http://www.epa.gov/osp/hstl/hstlnewsletter.htm ; current access available via PURL.