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"अलकतरा": अवतरणों में अंतर

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पंक्ति 11:
== बाहरी कड़ियाँ ==
* [https://web.archive.org/web/20100624160739/https://www.osha.gov/SLTC/coaltarpitchvolatiles/index.html ''Coal Tar Pitch Volatiles'' by OSHA]
* [httphttps://web.archive.org/web/20200727203928/https://pubs.acs.org/doi/full/10.1021/es803118b?cookieSet=1 ''Parking lots create sticky pollution problem'' by Erica Engelhaupt Environmental Science and Technology]
 
[[श्रेणी:कोयला|अलकतरा]]
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