TY  - BOOK
AU  - Leopold,Luna B.
TI  - Conservation networks,
AV  - QE75 .C5 no. 460 A, etc.
PY  - 1962///-
CY  - Washington
KW  - Hydrology
KW  - Research
KW  - Nature
KW  - Effect of human beings on
KW  - Water conservation
N1  - pt.A. The man and the hill.--pt.B. A national network of hydrologic bench marks
ER  -