TY  - BOOK
AU  - Clark,Ronnie
ED  - United States.
TI  - Erosion condition classification system
U1  - 551.302 
PY  - 1980///
CY  - Washington, D.C.
PB  - United States Department of Interior
KW  - Erosion
KW  - classification analysis
N1  - cover title; filing code 7317
ER  -