Cite
APA Citation
Institution,, B. S. (1983). Specification for underground loudspeaker communication systems in coal mines.. London : British Standards Institution. http://access.bl.uk/ark:/81055/vdc_100104438780.0x000001
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Institution,, B. S. (1983). Specification for underground loudspeaker communication systems in coal mines.. London : British Standards Institution. http://access.bl.uk/ark:/81055/vdc_100104438780.0x000001