2021DIN 21901-2:2021 Mine plans - Structure and list of standards - Part 2: General rules for symbols of mine plans
1970DIN 21901-2 E:2019-12 Mine plans - Structure and list of standards - Part 2: Interface for EDP based transfer of symbols of mining - Specific mapping
1994DIN 21901-2:1994 Mine plans - Structure and list of standards - Part 2: Interface for EDP based transfer of symbols of mining - Specific mapping