What does OWE stand for?

Eagle, CO - Location identifier - FAA (FAAL)

Office of Water Enforcement - Environmental Protection Agency (ERG)

Operating Weight Empty - of space shuttle - NASA

Optimum Working Efficiency

Outer Window Envelope - Business stationery

Welland Public Library, Ontario - Library symbol - National Library of Canada (NLC)

Western Plains Library System, Clinton, OK - OCLC symbol (OCLC)