INTERNATIONAL symposium and first world congress on the preservation and conservation of natural history collections: vol. 2, contributions on the status preservation, and conservation of natural history collections held in Madrid Spain on May 10-15, 1992 - INTERNATIONAL SYMPOSIUM AND FIRST WORLD CONGRESS ON THE PRESERVATION AND CONSERVATION OF NATURAL HISTORY COLLECTIONS (1st : 1992 : Madrid) (Direccion General de Bellas Artes y Archivos Ministrio de Cultura, 1992)