P. Walther

Sanitation is a business Approaches for demand-oriented policies

François Münger Sdc, P. Walther, 2004 .

The meaning of zoning in the management of natural resource lands

P. Walther, P. Walther, 1986 .

LAND ABANDONMENT IN THE SWISS ALPS A NEW UNDERSTANDING OF A LAND-USE PROBLEM

P. Walther, Universitiit Ziirich, 1986 .

Against idealistic beliefs in the problem-solving capacities of integrated resource management

Pierre Walther, P. Walther, 1987 .