Quasar Surveys

• Hamburg Objective Prism Sky Surveys - Online Access
  
• HQS- Source Catalogue
  
• HSS - Source Catalogue
  
• HRC - Hamburg/RASS Catalogue of optical Identifications
  
• RASS- Source Catalogue
  
• HQM - Hamburg Quasar Monitoring

Galactic Catalogues

• CGPN2 - Catalogue of Galactic Planetary Nebulae - Version 2000
  
• HAC - Catalogue of Stars in the Northern Milky Way having H-Alpha in Emission
  
• Catalogue of Radiostars
• Database of Circumstellar Masers