1. Use of geothermal energy for tomato drying;Andritsos;Geo-Heat Center Quarterly Bulletin,2003
2. District Heating Development Guide;Bloomquist,1987
3. Stories from a Heated Earth – Our Geothermal Heritage,1999
4. Out of Africa – Aquaculturist Ron Barnes uses geothermal water in southern Oregon to rear tropical fish from African rift lake;Clutter;Geo-Heat Center Quarterly Bulletin,2002
5. Downhole heat exchangers;Culver;Geo-Heat Center Quarterly Bulletin,1999