TY  - RPRT
TI  - Ontological Issues for national topographic mapping
AU  - Dalia E. Varanka
AU  - E. Lynn Usery
PY  - 2010
DO  - 10.3138/carto.45.2.103
UR  - https://pubs.usgs.gov/publication/70201143
ID  - 70201143
ER  -