TY  - RPRT
TI  - Measurement of slope deformation using quadrilaterals
AU  - Rex L. Baum
AU  - Arvid M. Johnson
AU  - Robert W. Fleming
PY  - 1988
DO  - 10.3133/b1842b
UR  - https://pubs.usgs.gov/publication/b1842B
ID  - b1842B
ER  -