TY  - RPRT
TI  - Behaviour of abandoned room and pillar mines in Illinois
AU  - G.G. Marino
AU  - R.A. Bauer
PY  - 1989
DO  - 10.1007/bf00896592
UR  - https://pubs.usgs.gov/publication/70015012
ID  - 70015012
ER  -