You are invited to attend the International Geothermal Summer School: 'International Geothermal Days - Oregon 1999' at Oregon Institute of Technology in Klamath Falls, Oregon. This meeting, from October 10 through 16, will feature of a series of workshops, courses and seminars; a continuation of earlier ones held in Europe since 1990. Klamath Falls is an ideal setting for colleagues from all over the world to meet and discuss the development and utilization of geothermal energy. With over 500 geothermal wells in the area and many types of geothermal utilization, the setting is an excellent field laboratory to demonstrate the direct utilization of this sustainable resource