What does HMSO stand for?

What does HMSO mean?

HMSO	Her Majesty's Stationary Office Governmental » Police
HMSO	Her Majesty's Stationary Office Governmental
HMSO	Hawaii Military Surfing Ohana Community » Non-Profit Organizations
HMSO	Highline Medical Services Organization Medical » Hospitals
HMSO	Hammarskjold Middle School Orchestra Community » Music
HMSO	Hammerson Business » London Stock Exchange
HMSO	Her/His Majesty's Stationery Office Governmental