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  2. O: 59 terms
  1. OASTHOUSE
  2. OBELISK
  3. OBSERVATION POST
  4. OBSERVATORY
  5. OCCUPATION SITE
  6. OCHRE MINE
  7. OCHRE WORKS USE OCHRE MINE
  8. OFF LICENCE
  9. OFFERTORY HOUSE
  10. OFFICE
  11. OFFICERS QUARTERS
  12. OGHAM INSCRIBED ROCK
  13. OGHAM INSCRIBED STONE
  14. OIL AND COLOUR WORKS USE DYE AND PIGMENT SITE
  15. OIL AND GREASE WORKS USE OIL WORKS
  16. OIL DRILLING PLATFORM
  17. OIL MILL
  18. OIL PIPELINE TERMINAL
  19. OIL REFINERY
  20. OIL RIG
  21. OIL RIG CONSTRUCTION YARD
  22. OIL STORAGE DEPOT
  23. OIL STORAGE TANK
  24. OIL WORKS
  25. OLD ROAD USE ROAD
  26. OPEN CAST MINE
  27. OPEN CAST WORKINGS USE OPEN CAST MINE
  28. OPERATIONS BLOCK
  29. ORANGERY
  30. ORATORY USE PRIVATE CHAPEL
  31. ORCHARD
  32. ORDNANCE FACTORY
  33. ORDNANCE OFFICE USE GOVERNMENT OFFICE
  34. ORDNANCE SURVEY CAMP USE COLBY CAMP
  35. ORDNANCE SURVEY CONTROL
  36. ORDNANCE SURVEY OFFICE USE GOVERNMENT OFFICE
  37. ORE BIN
  38. ORE SHED USE ORE STORE
  39. ORE STORE
  40. ORE WORKS
  41. ORNAMENT USE GARDEN ORNAMENT
  42. ORNAMENTAL BRIDGE
  43. ORNAMENTAL LAKE
  44. ORNAMENTAL POND
  45. ORNAMENTAL WELL
  46. ORPHANAGE
  47. ORTHOSTATIC WALL USE WALL
  48. OSSUARY
  49. OSSUARY CAVE USE OSSUARY
  50. OTTER TRAP
  51. OUT WORK USE OUTWORKS
  52. OUTBUILDING
  53. OUTDOOR ACTIVITY CENTRE
  54. OUTFALL SEWER
  55. OUTHOUSE USE OUTBUILDING
  56. OUTLET VALVE
  57. OUTWORKS
  58. OVEN
  59. OYSTER BEDS