♦   http://sat-nd.com

♦   www.astronautix.com

♦   www.russianspaceweb.com

♦   http://www.spacehorizons.com

♦   http://www.satsig.net/sslist.htm

♦   www.spaceline.org/history/3.html

♦   claudelafleur.qc.ca/Spacecrafts-index.html

♦   www.spacetoday.org/China/ChinaSatellites.html

♦   http://www.celestrak.com/satcat/boxscore.asp/3.html

♦   www.faa.gov/about/office_org/headquarters_offices/ast/faq

♦   http://www.aero.org/publications/crosslink/winter2001/03.html

♦   http://www.spaceandtech.com/spacedata/elvs/zenit_specs.shtml

♦   http://www.universetoday.com/84015/spectacular-sunset-launch-of-new-us-spy-satellite

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