| 21. | In the meantime, the rovers should begin surveying their surroundings.
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| 22. | Surveying instruments have characteristics that make them suitable for certain uses.
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| 23. | "Plane surveying " assumes the earth is flat.
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| 24. | This type of surveying is usually employed for large survey works.
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| 25. | Most countries'governments regulate at least some forms of surveying.
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| 26. | Most English-speaking countries consider building surveying a distinct profession.
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| 27. | The first surveying of the land occurred in the late 1740s.
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| 28. | Surveying was finally completed in 1875 and settlement began in earnest.
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| 29. | Retrograde verniers are found on some devices, including surveying instruments.
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| 30. | Land surveying and mapping are the responsibilities of the Polar Institute.
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