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  1. Topographic Abney level - Wikipedia

  2. Abney Clinometer (Abney Level) l Introduction, Uses

  3. Abney Level | U.S. Geological Survey - USGS.gov

  4. Abney Level - Description and applications of use - Tutotools

  5. What is an Abney Level? - Spiegato

  6. Hand Levels, Abney Levels, and Dumpy Levels Explained