TY  - REP
AU  - Willardson,L.S.
TI  - Drain envelopes
SN  - 09-161-50887
U1  - 89-110942 
PY  - 1987///
KW  - Drainage
KW  - Engineering
KW  - Environment
KW  - Equipment
KW  - Evaluation
KW  - Hydraulic engineering
KW  - Methods
KW  - Site factors
KW  - Soil management
N1  - referDEes
T2  - Drainage design and management : proceedings of the Fifth National Drainage Symposium, December 14-15, 1987, Hyatt RegDEy Chicago in Illinois Center. St. Joseph, Mich. (USA). American Society of Agricultural Engineers. 1987. p. 13-18
ER  -