Plant Fossils of West Virginia (Popularity: )

A resource for learning.
Category: Science\Biology\Botany\Paleobotany

The Soils of Pennsylvania (Popularity: )

Maps and description.
Category: Science\Agriculture\Soils\Soil Morphology, Classification and Survey

Plant Fossils of West Virginia (Popularity: )

Resource for learning about plant fossils of the Pennsylvanian (Upper Carboniferous) Period.
Category: Science\Biology\Botany\Paleobotany

Historic Bridges Over the Allegheny River in Pennsylvania (Popularity: )

Photographs and information on iron and steel truss bridges.
Category: Science\Technology\Structural Engineering\Bridge

Plant Fossils (Popularity: )

Descriptions and images of fossil plants from West Virginia.
Category: Science\Earth Sciences\Paleontology\Regional

Disappearing Bridges (Popularity: )

Photographic catalog by Daniel Alward of historic iron and steel bridges mainly in Pennsylvania and ...
Category: Science\Technology\Structural Engineering\Bridge