by Geyer, Alan R.
Environmental geology report ;
Roadside geology of Pennsylvania
The geology of Pennsylvania
Pennsylvania caves and other rocky roadside wonders
The practical geologist
Earth :inside and out
Reading the rocks : the autobiography of the earth
The geology of Centre County
Scenic science of the national parks : an explorer's guide to wildlife, geology, and botany
Hiking America's geology
Mineral collecting in Pennsylvania
Geology and mineral resources of the Bellefonte quadrangle, Pennsylvania
A collection of occasional surveys of iron, coal and oil districts in the United States, made during the last ten years
The history of earth : an illustrated chronicle of our planet
Earth : an intimate history
Basin and range
Earth story : the shaping of our world
Rock formations and unusual geologic structures :exploring the earth's surface
Measuring eternity : the search for the beginning of time
Rising from the plains
Backroads of Pennsylvania : your guide to Pennsylvania's most scenic backroad adventures
Pennsylvania's scenic Route 6 : a guide to historic sites, towns and natural lands
Discovery Channel rocks & minerals : an explore your world handbook
An introduction to fossils and minerals : seeking clues to the earth's past
Annals of the former world
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
Inside the earth
Geology the study of rocks
One strange rock
Guide to the state historical markers of Pennsylvania
Nature's clocks : how scientists measure the age of almost everything
Chesapeake invader :discovering America's giant meteorite crater
Natural wonders of North America
The universe within : discovering the common history of rocks, planets, and people
My teacher is a dinosaur : and other prehistoric poems, jokes, riddles, & amazing facts
Explore rocks and minerals!
Pennsylvania. Bureau of Topographic and Geologic Survey.
Bolles, William H.
> Pictorial works.
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