X-radiograph(s) of "Man with Arrow"

Rogier van der Weyden

X-radiograph(s) of "Portrait of a Lady"

Michiel van Musscher

X-radiograph(s) of "Portrait of a Man"

Jan Lievens

X-radiograph(s) of "Portrait of Mr. Nodler"

Gustave Courbet

Building Addition and Alterations, Philadelphia, 1944-1946: Third floor layout (1/8" =1'-0")

B. P. Walter Gropius

["Rohrbach," 1923, drawing by Lyonel Feininger]

Lyonel Feininger

[Drawing by Lyonel Feininger]

Lyonel Feininger

Untitled (circus lion walking across pegged bridge/lions and tigers posed on climbing apparatus)

Joseph Janney Steinmetz

Untitled (women walking up rope ladders)

Joseph Janney Steinmetz

X-radiograph(s) of "The Piazzetta, Venice"

Giovanni Antonio Canal, called Canaletto

X-radiograph(s) of "Astronomer"

Jan Vermeer

X-radiograph(s) of "Thomas Hancock"

John Singleton Copley

X-radiograph(s) of "Benjamin Pratt (false signature added)"

Attributed to John Smibert

X-radiograph(s) of "Trowbridge"