In 1956, as part of a larger archaeological salvage project for The Dalles Reservoir sponsored by the National Park Service and under the general direction of Douglas Osborne of the University of Washington, a complete record by prints was made of some 400 petroglyphs along a 15 mile stretch of the Columbia River. The original idea for the method and its application to petroglyph recording belongs to Sari Dienes, who has used it in her own art. With the assistance of the writer, Mrs. Dienes did the actual printing of the designs. The project was successfully completed with the aid of a supplementary grant from the Seattle Art Museum.