000			00270nam a2200097Ia 4500
005			20250424112856.0
008			250424s9999 xx 000 0 und d
300			_a87-177 p. : ill. ; 30 cm.
650			_aMining engineering--Periodicals. Geology--Periodicals.
942			_cSR
999			_c37649 _d37649