TY  - RPRT
TI  - User oriented, interactive Multics computer programs to create grid cell, contour, and perspective maps using Surface Display Library
AU  - R. K. Mark
AU  - E. B. Newman
PY  - 1981
DO  - 10.3133/ofr81513
UR  - https://pubs.usgs.gov/publication/ofr81513
ID  - ofr81513
ER  -