1. Title
  2. Basic Definitions
  3. Vertical Line
  4. Horizontal Line
  5. Gravity
  6. Level Line
  7. Plane
  8. Horizontal Surface
  9. Level Surface
  10. Leveling
  11. Question
  12. Tools
  13. Sea Level
  14. Point A
  15. Placement
  16. R1
  17. R2
  18. R3
  19. Elevation
  20. Good Practices
  21. Level Rod
  22. Inaccurate Elevation
  23. Level Instrument
  24. Line of Sight
  25. Parallel
  26. R2 Difference
  27. Correction
  28. Error
  29. Method
  30. Stadia
  31. Steel Tape
  32. Air Refraction
  33. Angle
  34. Cancel
  35. End
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