"प्राचीनभूगर्भशास्त्रम्" इत्यस्य संस्करणे भेदः

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पङ्क्तिः २१:
* [http://www.scienceblog.com/cms/blog/7243-science-and-technology-ancient-india-20159.html Science and Technology in Ancient India] (Dr VS Prasad's blog)
* [http://www.hindubooks.org/sudheer_birodkar/india_contribution/ Ancient India's Contribution to Our World's Material (Temporal) Culture]
* [http://archive.is/20121216122637/india_resource.tripod.com/physics.htm History of the Physical Sciences in India]
* [http://sanskritdocuments.org/articles/ScienceTechSanskritAncientIndiaMGPrasad.pdf Science and Technology in Ancient India]
* [http://countrystudies.us/india/101.htm ''India: Science and technology'', U.S. Library of Congress.]
"https://sa.wikipedia.org/wiki/प्राचीनभूगर्भशास्त्रम्" इत्यस्माद् प्रतिप्राप्तम्