Fallingwater House At Bear Run
Theodore Clutter
Fallingwater
Bill Bachmann
Pennsylvania Military College
H. Armstrong Roberts/ClassicStock
Penn Station Clock
Van D Bucher and Photo Researchers
Theater Audience Viewed From Stage
H. Armstrong Roberts/ClassicStock
Pennsylvania Station, Nyc, 1910-20
Science Source
Meeting Of The Molly Maguires, 1874
Photo Researchers
Rainbow Over Lake Wallenpaupack
Michael P Godomski and Photo Researchers
The Landing Of William Penn, 1682
Photo Researchers
Ruffed Grouse
Paul J. Fusco
Pennsylvania Firefly
Roger Hall
Pennsylvania Station, Nyc
Science Source
Farm near Klingerstown
USDA and Photo Researchers
Autumn In Central Pennsylvania
Nasa
Loyalsock Creek
Michael Gadomski
Join Or Die French And Indian War
Photo Researchers
Pittsburgh Pirates Playing At Pnc
Bill Bachmann
College Football Game, C. 1950s
H. Armstrong Roberts/ClassicStock
George Washington At Valley Forge
Science Source
Battle Of Gettysburg Picketts Charge
Science Source
Battle Of Gettysburg, Culps Hill, 1863 #1
Science Source
Fern Fossil
Theodore Clutter
Famous Villa Of Frank Lloyd Wright
Adam Sylvester
Liberty Bell
Van D. Bucher
Betsy Ross House
Dick Hanley
Pittsburgh, Pennsylvania #1
Bill Bachmann
Pennsylvania State Capital Building
Theodore Clutter
Pennsylvania State Capitol Building New
Theodore Clutter
Pennsylvania State Capitol Building
Theodore Clutter
Pennsylvania State Capitol Complex
Theodore Clutter
Pennsylvania State Capitol Building #1
Theodore Clutter
Pennsylvania Station, Nyc, 1910-20 #2
Science Source
Plum Pox Virus
Science Source
Pennel Run
Michael P. Gadomski
Family Picnicking Under A Tree
H. Armstrong Roberts/ClassicStock
Technicians Connecting Wires Of Eniac
Science Source
Stamp Act Deplored In Newspaper #1
Photo Researchers
Washington And Lafayette At Valley Forge
Photo Researchers
Johnstown Flood, 1889
Science Source
Homestead Strike, 1892
Photo Researchers
The Liberty Bell, Philadelphia
Rafael Macia
Flower Garden
Michael P. Gadomski
Horse-drawn Canal Boat, C.1960s
G Hampfler and ClassicStock
Mules Towing Boat Down Lehigh, C.1920s
H. Armstrong Roberts/ClassicStock
Canon At Valley Forge
H. Armstrong Roberts/ClassicStock
Battle Of Gettysburg, Culps Hill, 1863
Science Source
Patrick Henry, First Continental
Science Source
Homer City Coal-fired Power Plant
Theodore Clutter
Three Mile Island
Theodore Clutter
Neuropteris And Alethopteris
Theodore Clutter
Fog On The Lehigh River
Michael Gadomski
Luna Moth #1
Michael Lustbader
William Penn, Founder Of Pennsylvania
Photo Researchers
William Penn, Founder Of Pennsylvania #1
Photo Researchers
William Penn, Founder Of Pennsylvania #2
Photo Researchers
Pittsburg, Pennsylvania
Rafael Macia
Pittsburgh, Pennsylvania
Bill Bachmann
Dome, Pennsylvania State Capitol
Theodore Clutter
Susquehanna River, Pennsylvania
Theodore Clutter
Sunrise In Pennsylvania
Michael Lustbader
Mating American Toads
Jeffrey Lepore
Philadelphia, Pa
Rafael Macia
Independence Hall Fireworks
Joseph Nettis
Sunset On Lake Erie
Michael Gadomski
City Center Of Philadelphia
Rafael Macia
Coal Power Plant
Theodore Clutter
Barrens Buck Moth
Jeffrey Lepore
Barrens Buck Moth #1
Jeffrey Lepore
Barrens Buck Moth Eggs
Jeffrey Lepore