TY  - RPRT
TI  - Map showing depth to bedrock, Ludlow Quadrangle, Massachusetts
AU  - C.J. Londquist
AU  - G. W. Leo
PY  - 1974
DO  - 10.3133/mf503b
UR  - https://pubs.usgs.gov/publication/mf503B
ID  - mf503B
ER  -