TY  - BOOK
AU  - Boon G K
ED  - Netherlands Economic Institute
TI  - Case study of a construction process: field trenches
U1  - 631.6 
PY  - 1960///
CY  - Rotterdam
PB  - NEI
KW  - Drainage of farm land
KW  - Field trenches
N1  - Alternative techniques of production, progress report; no.5
ER  -