The document defines the drafting of mining-specific maps. It contains the necessary symbols, abbreviations, and terms for displaying the petrological features of metamorphous rocks as well as of other rock transformations on mining-specific maps and plans.
DIN 21920-3:1996 history
1996DIN 21920-3:1996-04 Mine plans - Petrography - Part 3: Metamorphic and other lithogenetic phenomena
1996DIN 21920-3:1996 Mine plans - Petrography - Part 3: Metamorphic and other lithogenetic phenomena
0000 DIN 21920-3:1992
1984DIN 21901:1984 Mine plans; structure and list of standards; general principles