00437nam a2200121Ia 450000500170000010000240001724500480004126000090008952001750009858300190027394200060029299900170029820260716043304.0  aJohnson, Johna Till  aVideoconferencing : not just talking heads.  c1991  aLooks at how the leading manufacturers of videoconferencing equipment match up as recent drop in prices and increased picture quality make it a very appealing technology.  c3/7/00kM2LMGR  cA  c44158d44158