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		No cover image available AUA guidelines for backfilling and contact grouting of tunnels and shafts by Henn, Raymond W \| American underground construction association. Material type: Text Publication details: USA American Society of Civil Engineers 2003Availability: Items available for loan: 1 Call number: 624.19 A45A. Place hold
		No cover image available Practical guide to grouting of underground structures by Henn, Raymond W. Material type: Text Publication details: New York ASCE 1996Availability: Items available for loan: 1 Call number: 624.19 H54P. Place hold

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