TY  - RPRT
TI  - Exploration geophysics calculator programs for use on Hewlett-Packard models 67 and 97 programmable calculators
AU  - David L. Campbell
AU  - Raymond D. Watts
PY  - 1978
DO  - 10.3133/ofr78815
UR  - https://pubs.usgs.gov/publication/ofr78815
ID  - ofr78815
ER  -