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Theodore Clutter
Pompeii, Alexander Mosaic, Battle
Science Source
Long-haired Dachshund
John Daniels
Christine De Pizan Lecturing To Men
Photo Researchers
Atom Collision
Mike Agliolo
Mansa Musa, Emperor Of The Mali Empire
Science Source
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James Zipp
Roseate Spoonbill #18
Millard H Sharp
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Omikron
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Michael Lustbader
American Dipper Cinclus Mexicanus
James Zipp
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James Zipp
New Vitruvian Woman
Jim Dowdalls and Photo Researchers
Anthrax Bacteria Sem #9
Science Source
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Science Source
Detail Of The Madonna Of St. Francis
George Holton
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Scott Linstead
Akhenaton With Sun God
Science Source
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Science Source
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Mark Newman
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Kenneth Eward
Welsh Mountain Pony Colt #3
Rolf Kopfle
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Rolf Kopfle
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Wellcome Images
Bessie Coleman, American Aviator
Science Source
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Millard H. Sharp
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Steve Cooper
Snow Leopard Panthera Uncia
Thomas And Pat Leeson
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C.r. Sharp
Black-tailed Prairie Dog Family At Den
Ivan Kuzmin
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Theodore Clutter
Satan, By Dore
Photo Researchers
Newport, Rhode Island
Mathias T. Oppersdorff
Pompeii, Alexander Mosaic, Battle #1
Science Source
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John Daniels
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Wellcome Images
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Millard H. Sharp
Thangka Painting #1
Ray Ellis
Yorkshire Terrier #2
Bonnie Sue Rauch
A Christmas Carol, Freds Christmas Party
Science Source
Farm near Klingerstown
USDA and Photo Researchers
Rough Collie #2
Jean-Michel Labat
Path Through Aspens
James Steinberg
Indus Valley Unicorn Relief
Science Source
Joan Of Arc, French National Heroine #4
Photo Researchers
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Photo Researchers
Dance Of Apollo With The Nine Muses
Photo Researchers
Crossing River In Land Cruiser
Greg Dimijian
Bernese Mountain Dog Puppy #2
John Daniels
Theseus Mosaic, 4th Century
Science Source
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Millard H. Sharp
Wild Horses Mating
Michael Lustbader
Black And Gold Sea Slug
Newman & Flowers
Chagall Window, Israel
Lionello Fabbri
Spinone Puppies
John Daniels
Song Of Roland Charlemagne
Photo Researchers
Roman Marine Mosaic, 2nd Century Bc
Science Source
Elephant
Gregory G Dimijian and Photo Researchers
Emerald Ash Borer
Science Source
Astronaut Clay Anderson
Nasa
Death Of Roland At The Battle #1
Photo Researchers
Bernese Mountain Dog With Fox
Hans Reinhard
Abraham Lincoln Near Antietam 1862
Getty Research Institute
Slime Mold Spores
Eye of Science
Frill-necked Lizard
BG Thomson
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Reticulated Python
Chris Mattison/FLPA