TY  - BOOK
AU  - Sil Versides, C.R. and Sundberg
TI  - Operational efficiency in forestry
SN  - 0792300637
AV  - SD 587.E33.S5 1989
CY  - London
PB  - Kluwer Academic 
KW  - Forestry efficiency
KW  - Forests and forestry--labour productivity
KW  - Forestry engineering
ER  -