Planning and managing forestry research : guidelines for managers /

по Gregersen, H. M.
Опубликовано 1990

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

по Gregersen, H. M.
Опубликовано 2007

Guidelines for economic appraisal of watershed management projects /

Опубликовано 1987

Valuing forests : context, issues and guidelines /

Опубликовано 1995