by D'Invilliers, E. V. 1857-1928.
Report of progress (Geological Survey of Pennsylvania) ;
The geology of Pennsylvania
Reading the rocks : the autobiography of the earth
Earth :inside and out
Outstanding scenic geological features of Pennsylvania
Roadside geology of Pennsylvania
Nature's clocks : how scientists measure the age of almost everything
Pennsylvania caves and other rocky roadside wonders
Measuring eternity : the search for the beginning of time
Earth : an intimate history
The practical geologist
The history of earth : an illustrated chronicle of our planet
Rock formations and unusual geologic structures :exploring the earth's surface
Basin and range
Earth story : the shaping of our world
Rising from the plains
A collection of occasional surveys of iron, coal and oil districts in the United States, made during the last ten years
Geology and mineral resources of the Bellefonte quadrangle, Pennsylvania
Geology the study of rocks
Dirtmeister's nitty gritty planet Earth : all about rocks, minerals, fossils, earthquakes, volcanoes, and even dirt!
In suspect terrain
Nature's extremes : inside the great natural disasters that shape life on earth
An introduction to fossils and minerals : seeking clues to the earth's past
Discovery Channel rocks & minerals : an explore your world handbook
Inside the earth
Annals of the former world
One strange rock
The universe within : discovering the common history of rocks, planets, and people
Chesapeake invader :discovering America's giant meteorite crater
Natural wonders of North America
Eruption! : volcanoes and the science of saving lives
A history of Earth : in 100 groundbreaking discoveries
Explore rocks and minerals!
How mountains are made
The man who found time : James Hutton and the discovery of Earth's antiquity
The rock cycle
Earthshake : poems from the ground up
Geology rocks! : 50 hands-on activities to explore the earth
Geological Survey of Pennsylvania., Pennsylvania. Board of Commissioners for the Second Geological Survey.
Lesley, J. P. 1819-1903., Ewing, A. L., Genth, F. A. 1820-1893., Wuth, Otto.
> Centre County.
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