TY  - RPRT
TI  - Graphic-locator method in geologic mapping
AU  - David J. Varnes
AU  - Tommy L. Finnell
AU  - Edwin V. Post
PY  - 1959
DO  - 10.3133/b1081a
UR  - https://pubs.usgs.gov/publication/b1081A
ID  - b1081A
ER  -