DIN 21917-2 - DRAFT
DIN 21917-2 - DRAFT Draft Document - Mine plans - Strata and ground movements - Part 2: Geotechnical measuring points
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2014
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2014