History
In total, four surveys have been conducted in the commonwealth. The first survey was created in 1836, making it one of the oldest geological surveys in the United States. It was followed by the Second Survey, which ran from 1874 to approximately 1895; and the Third Survey, which ran from 1910 to 1919. The fourth, and current, survey was created in 1919 and continues today.
Read more about this topic: Pennsylvania Geological Survey
Famous quotes containing the word history:
“We know only a single science, the science of history. One can look at history from two sides and divide it into the history of nature and the history of men. However, the two sides are not to be divided off; as long as men exist the history of nature and the history of men are mutually conditioned.”
—Karl Marx (1818–1883)
“... all big changes in human history have been arrived at slowly and through many compromises.”
—Eleanor Roosevelt (1884–1962)
“No matter how vital experience might be while you lived it, no sooner was it ended and dead than it became as lifeless as the piles of dry dust in a school history book.”
—Ellen Glasgow (1874–1945)