TY  - RPRT
TI  - BASIC programs for computing displacements, strains, and tilts from quadrilateral measurements
AU  - Arvid M. Johnson
AU  - Rex L. Baum
PY  - 1987
DO  - 10.3133/ofr87343
UR  - https://pubs.usgs.gov/publication/ofr87343
ID  - ofr87343
ER  -