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Fresco on reinforced cement in a galvanized-steel framework, 93 3/4 x 74" (238.1 x 188 cm). The Museum of Modern Art, New York. Abby Aldrich Rockefeller Fund. © 2011 Banco de México Diego Rivera & Frida Kahlo Museums Trust, México, D.F./Artists Rights Society (ARS), New York. Photograph courtesy The Museum of Modern Art, Department of Imaging Services (John Wronn)

Charcoal on paper, 98 3/8 x 78" (250 x 198 cm). Private collection, Mexico. © 2011 Banco de México Diego Rivera & Frida Kahlo Museums Trust, México, D.F./Artists Rights Society (ARS), New York. Photograph © Eumelia Hernández and Ricardo Alvarado; Instituto Nacional de Bellas Artes

X-radiograph of Agrarian Leader Zapata, showing its metal framework. Image by Cynthia Albertson

The back of Agrarian Leader Zapata, showing a layer of cementlike material over the panel’s metal structure. Image courtesy The Museum of Modern Art, Department of Imaging Services (Jonn Wronn)