Aportación al conocimiento del paisaje vegetal del alto valle del Ebro: los yacimientos de La Hoya y San Miguel de Atxa - Iriarte, María José (The late Quaternary in the Western Pyrenean Region: Proceed. of the international Conference on the environment and the human society in the Western Pyrenees and the Basque Mountains during the upper Pleistocene and the Holocene. (Gasteiz/Vitoria, 3-5 May 1990))