5 Yale Joel, _Life_ magazine, copyright © Time, Inc.
6 Her Majesty the Queen, copyright © reserved
7 & 8 Ullstein Bilderdienst
10 Rijksmuseum, Amsterdam
23 National Gallery of Art, Washington, D. C., Andrew Mellon
Collection
35 & 40 National Gallery of Art, Washington, D. C., Chester Dale
Collection
43 National Gallery of Art, Washington, D. C., Andrew Mellon
Collection
★ U.S. GOVERNMENT PRINTING OFFICE: 1974—747-556/15
The U. S. Atomic Energy Commission publishes this series of information
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