Dr N Genean Dunn: 1 book

Yellowstone National Park contains over half the world�s active geysers, with more than 700 within its 3,472 square miles. The most famous geyser is Old Faithful, named in 1870 during the Washburn-Langford-Doane Expedition. In 1871, the US Geological and Geographical Survey, led by Dr. F.V. Hayden,...