Some issues accompanied by CD-ROMs and information cards.
No longer distributed to depository libraries in a physical form.
Also issued to depository libraries on microfiche 1989-1998; on CD-ROM, 2000-
Some issues also available via Internet at the NSF web site. Address as of 7/24/2002: http://www.nsf.gov/sbe/srs/seind/start.htm; current access is available via PURL.
Complemented 1989- by: National patterns of r & d resources.