Govt. funder of astronomy projects

• Agcy. that supports research in economics and geology
• Bad letters stamped on a check
• Bouncer's inits.?
• Unwelcome letters from a bank
• Check-bouncing letters
• Bouncing letters
• Reason for a bounced check: Abbr.
• Math prof's funding source
• Bad check ltrs

Wikipedia Word definitions in Wikipedia
NSF may stand for: