Polet, G. (Cultural Anthropology), 1991
Rattan and bamboo utilization in a Sierra Madre community.

Kusters, N. (Tropical Forestry), 1991
Carabao loggers, kaingineros and the forest: an environmental profile of Lagum, N.E. Luzon.

Wakker, E. (Phys. Soc. Geography)., 1991
From cane to Cory-set. The economic value and sustainability of rattan trade in Region .

Zeegers, M. (Soc. Geography), 1991
Cogon gathering: only for the poor? Grassland use in a grassland-based community in N.E. Luzon.

Hoekstra, S. (Public Administration), 1991
Grassroot politics. The implementation of environmental policies regarding grasslands in N.E. Luzon.

Doedens, B. (Soc. Geography), 1991
Sustainable land use and destruction along the forest fringe. A research on land use in an Ifugao migrant settlement in the uplands of the Sierra Madre.

Ypma, D. (Cultural Anthropology), 1991
Dy's people of Abra and the story of a project in context, N.E. Luzon.

Plugge, I. (Public Administration), 1991
Patience is a virtue. The question of sustainability and land insecurity in the Philippines.

Wedda, C. (Social Sciences), 1991
Soil is like a living creature that can be hurt. A thesis about the attitude to nature in an upland community of the Sierra Madre.

Simons, H. (Tropical Forestry), 1991
Kanya kanya. The environment impact of forest utilization in the Antagan watershed, Tumauini.

Boerboom, L. (Tropical Culture), 1991
Quantification of peak flow changes due to deforestation, N. E. Luzon.

Bautista, V., 1991 (Forestry)
Biology of Nepytia Cansoria. A Defoliator of Narra.

Valiente, B., 1991 (Forestry)
Implementation of Government Policies Regarding Grasslands in Northeastern Luzon, A Review and Assessment.