What are Erich Waschak and Leo Forstenlechner remembered for as noted in the nonfiction book, The White Spider: The Story of the North Face of the Eiger?

Waschak and Forstenlechner are credited and remembered for being the first mountaineers to climb the North Face of the Eiger in a single day. The climbers made the journey in 18 hours in July of 1950, bivouacking on the summit after their climb and descending the next day.