TY  - RPRT
TI  - The selective salvation of Zeiss Ni 1 levelings
AU  - Robert O. Castle
AU  - Thomas D. Gilmore
PY  - 1994
DO  - 10.3133/ofr94698
UR  - https://pubs.usgs.gov/publication/ofr94698
ID  - ofr94698
ER  -