Surveys
narrower: Star counts
narrower: Sky surveys
narrower: Kapteyn Selected Areas
narrower: Redshift surveys
narrower: Radio source counts
narrower: X-ray surveys
narrower: Ultraviolet surveys
narrower: Galaxy counts
type: Concept
broader: Astronomical reference materials

Redshift surveys
type: Concept
broader: Surveys

Kapteyn Selected Areas
type: Concept
broader: Surveys

Ultraviolet surveys
type: Concept
broader: Surveys

Galaxy counts
type: Concept
broader: Surveys

Astronomical reference materials
type: Concept
narrower: Surveys

Sky surveys
type: Concept
broader: Surveys

Radio source counts
type: Concept
broader: Surveys

X-ray surveys
type: Concept
broader: Surveys

Star counts
type: Concept
broader: Surveys