The document defines the drafting of mining-specific maps. The document contains the necessary symbols, abbreviations and terms for the display of petrological features of the deposit and the adjacent strata in potash and rock salt mining.#,,#
DIN 21920-7:1996 history
1996DIN 21920-7:1996-04 Mine plans - Petrography - Part 7: Potash and rock salt mining
1996DIN 21920-7:1996 Mine plans - Petrography - Part 7: Potash and rock salt mining
0000 DIN 21920-7:1993
1984DIN 21901:1984 Mine plans; structure and list of standards; general principles