[1]
O'Leary, M. et al. 1966. FORTRAN IV and MAP Program for Computation and Plotting of Trend Surfaces for Degrees 1 through 6.
Bulletin (Kansas Geological Survey)
. (Jan. 1966), 1–48. DOI:
https://doi.org/10.17161/kgsbulletin.no. 23504
.