1. On the computation of the effect of attraction of mountain-masses, as disturbing the apparent astronomical latitude of stations in geodetic surveys;Airy;Philos. Trans. Roy. Soc. London,1855
2. ASTM, 2005a. Standard test method for determination of rock hardness by rebound hammer method. D5873.
3. ASTM, 2005b. Standard test method for determination of the point load strength index of rock and application to rock strength classifications. D5731.
4. ASTM, 2005c. Standard practices for preparing rock core as cylindrical test specimens and verifying conformance to dimensional and shape tolerances. D4543.
5. ASTM, 2005d. Standard test method for unconfined compressive strength of intact rock core specimens. D2938.