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|c 8.50
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|a eng
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|a 622.142
|b IND/CO
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| 110 |
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|a Indian Standards Institution .
|c (New Delhi )
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| 245 |
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|a Code of practice for sub surface exploration by pits, trenches, drifts and shafts, IS 4453-1980 /
|c Indian Standards Institution.
|h Textual Documents
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| 250 |
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|a 1 /
|b .
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|a New Delhi :
|b Indian Standards Institution ,
|c 1980.
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|a 18 ; .
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| 365 |
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|a 8.50
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