Study of GPS and its accessories.
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- Dr. B. C. Punmia, Ashok Kumar Jain, Arun Kumar Jain,"Surveying", Vol. 2, Laxmi Publications, Sixteenth edition, 2016
- N.N. Basak,"Surveying and Levelling", McGraw Hill Education, 2nd edition, 2017
- W. Schofield, Mark Breach, "Engineering Surveying", Butterworth-Heineman, Sixth Edition, 2007