TY  - RPRT
TI  - Lunar crater morphology and relative age determination of lunar geologic units - Part 1, Classification; Part 2, Applications
AU  - Howard A. Pohn
AU  - Terry W. Offield
PY  - 1969
DO  - 10.3133/ofr69209
UR  - https://pubs.usgs.gov/publication/ofr69209
ID  - ofr69209
ER  -