TY - RPRT TI - Forward modeling computer program for the very low frequency, radio-wave, terrain-resistivity electromagnetic method: VLF.BAS AU - Deborah G. Grantham AU - F.P. Haeni AU - David L. Mazzaferro PY - 1986 DO - 10.3133/ofr86407w UR - https://pubs.usgs.gov/publication/ofr86407W ID - ofr86407W ER -