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Cover image for Results of leveling refraction tests by the National Geodetic Survey

Results of leveling refraction tests by the National Geodetic Survey

Joyner Library - Microforms B300
Call Number: C 55.13:NOS 92 NGS 22
Cover image for Test results of first-order class III leveling

Test results of first-order class III leveling

Joyner Library - Fed Docs Stacks
Call Number: C 55.13:NOS 68 NGS 4
Cover image for Control leveling

Control leveling

Joyner Library - Fed Docs Stacks
Call Number: C 55.13:NOS 73 NGS 8