Cite
MLA Citation
British Standards Institution,. BS EN ISO 11961 AMD1. Petroleum and natural gas industries. Steel drill pipe.. London : British Standards Institution, 2019. http://access.bl.uk/ark:/81055/vdc_100105141696.0x000001
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British Standards Institution,. BS EN ISO 11961 AMD1. Petroleum and natural gas industries. Steel drill pipe.. London : British Standards Institution, 2019. http://access.bl.uk/ark:/81055/vdc_100105141696.0x000001