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eGyanKosh: BGYCT -135 Petrology Study Material Free Download (IGNOU 2025)

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Block-1 Igneous Petrology- I

Block-2 Igneous Petrology- II

Block-3 Sedimentary Petrology

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अगर बुक्स डाउनलोड करने में प्रॉब्लम हो तो इस विडियो को देखें