The National Geographic Magazine, Vol. I., No. 3, July, 1889

The National Geographic Magazine, Vol. I., No. 3, published in July 1889, is a scientific periodical featuring articles on geography. This edition includes a significant piece by William Morris Davis titled 'The Rivers and Valleys of Pennsylvania,' which explores the state's river systems and their geological evolution. The magazine covers topics such as cartography, hydrology, and the geological transformations that have shaped landscapes, making it a notable early contribution to geographical literature.