TY  - RPRT
TI  - Schmidt hammer test method for field determination of physical properties of zeolitized tuff
AU  - John R. Ege
AU  - Danny R. Miller
AU  - Walter Danilchik
PY  - 1970
DO  - 10.3133/ofr70117
UR  - https://pubs.usgs.gov/publication/ofr70117
ID  - ofr70117
ER  -