TY  - RPRT
TI  - The United States 1998
AU  - W. C. Butterman
AU  - L. McCartan
AU  - D.E. Morse
AU  - S.F. Sibley
PY  - 1999
UR  - https://pubs.usgs.gov/publication/70021587
ID  - 70021587
ER  -