<p>Posed Grizzly Bear attack during construction of Grizzly Bear Group. 1941.</p>
<p>Constructing floor of Bald Eagle Group, Bird Hall. 1961.</p>
<p>Construction of Man and His Changing World Exhibit, Roosevelt Memorial Hall. 1969.</p>
<p>Display case, Biology of Bird Hall, American Museum of Natural History. 1942.</p>
<p>Making mold to cast clay model of Titanotherium. 1914.</p>
<p>Young visitor viewing Triceratops Skeleton, Tyrannosaurus Hall. 1959.</p>
<p>Mr. and Mrs. Bruce Horsefall at work on the background of the Wild Turkey Habitat Group, North American Bird Hall. 1907.</p>
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