'National Geographic Magazine Vol. 01 No. 3' Summary

**The Rivers and Valleys of Pennsylvania**: This article explores the major rivers and valleys of Pennsylvania, describing their physical characteristics, economic importance, and historical significance. **Topographic Models**: This article discusses the use of topographic models to represent the Earth's surface, highlighting their applications in education, engineering, and military planning. **International Literary Contest**: This article announces an international literary contest sponsored by the National Geographic Society, inviting submissions of original essays, stories, and poems on geographical topics.