| C1. | User's Guide for the Installation of Bench Marks and Leveling Requirements for Water Level Stations, October 1987 (PDF) 19 meg.
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| C2. | User's Guide For Writing Bench Mark Descriptions, Updated January 2002 (PDF) 115k
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| C3. | User's Guide For Electronic Levels, Updated January 2003 (PDF) 2.3 meg.
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| C4. | User's Guide For GPS Observations, Updated December 2009 (PDF) 2.7 meg.
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| C5. | CO-OPS GPS Observations Implementation Plan, January 2003 (PDF) 31k
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| C6. | NOAA Technical Memorandum "NOS NGS-58, Guidelines for Establishing GPS-Derived Ellipsoid Heights (Standards 2 cm and 5 cm), version 4.3", November 1997
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| C7. | Standards and Specifications for Geodetic Control Networks, Federal Geodetic Control Committee, September 1984.
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| C8. | Setting a NGS 3-D Monument, July 1996 (PDF) 109k
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| C9. | Attachment R, Requirements for Digital Photographs of Survey Control, NGS, January 2008 (PDF) 90k
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| C10. | Real-Time Kinematic (RTK) Team Final Report (PDF) 325k
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| C11. | Attachment T, Setting a Concrete Mark (PDF) 70k
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| C12. | Attachment U, Setting a Survey Disk in Bedrock (PDF) 51k
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| C13. | Attachment X, Performing Bench Mark Ties (PDF) 100k
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