A catalog of 1,067,648 quasars is available from Quasars.Org, It is
19 Mb zipped. A ReadMe is provided which gives full details, file
layout, and references for the source data.
The data is de-duplicated across the source catalogs, and photometry
is supplied from APM and USNO-A optical data. Sample data is
available for quick browsing on the web page.
Get it at:
http://quasars.org/milliquas.htm
QUASARS.ORG. There is no second place.
Eric Flesch