TY  - RPRT
TI  - A new strategy for developing Vs 30 maps
AU  - David J. Wald
AU  - Leslie McWhirter
AU  - Eric Thompson
AU  - Amanda S. Hering
PY  - 2011
UR  - https://pubs.usgs.gov/publication/70005248
ID  - 70005248
ER  -