Electronic reproduction. Boulder, Colo. : Institute for Telecommunications Sciences. Mode of access: Internet from the ITS web site. Address as of 6/14/06: http://www.its.bldrdoc.gov/pub/ntia-rpt/94-303-1 (vol. 1) and http://www.its.bldrdoc.gov/pub/ntia-rpt/94-303-2 (vol. 2); current access is available via PURL.