Planning and managing forestry research : guidelines for managers /

ανά Gregersen, H. M.
Έκδοση 1990

Integrated watershed management : connecting people to their land and water /

ανά Gregersen, H. M.
Έκδοση 2007

Guidelines for economic appraisal of watershed management projects /

Έκδοση 1987

Valuing forests : context, issues and guidelines /

Έκδοση 1995