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The influence of potato cultivation on the natural bunchgrass páramo in the Colombian Cordillera Oriental / Wim Ferwerda.
- University of Amsterdam. Department of palynology and paleo/actuo-ecology. Hugo de Vries laboratory,
- 1987.
- Amsterdam :
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Cocalero movements in Peru and Bolivia : cocoa or death? / [Allison Spedding Pallet, Hugo Cabieses Cubas].
- Transnational institute (TNI),
- 2004.
- Amsterdam :
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Vegetation mapping in the páramo of Chingaza (Cundinamarca, Colombia) / L. Dierikx, M. Kaandorp.
- Hugo de Vries laboratory,
- 1986.
- Amsterdam :