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UNA COMPOSICION POLIMERICA, UN FLUIDO DE MANTENIMIENTO DE POZOS ACUOSOS, UN PROCESO PARA PREPARAR UNA COMPOSICIoN POLIMERICA ACUOSA Y UN METODO PARA LLEVAR A CABO OPERACIONES DE PERFORACION O DE MANTENIMIENTO DE POZOS.
Aspects of stone weathering, decay and conservation: proceedings of the 1997 Stone Weathering and Atmospheric Pollution Network Conference (SWAPNET'97), the Robert Gordon University, 15-17 May 1997