NYC, Rockefeller Center, Lower Plaza, 1950s.

Ms. Bubley was apparently deeply impressed by the care exercised by Rockefeller Center workers on the works of art displayed there, and she demonstrates that feeling in these two photographs.

Photograph by Esther Bubley.

See also another image of Rockefeller workers working on the art displayed there. 

See this image in the Portraits of Labor exhibit.

Courtesy Howard Greenberg Gallery, New York City.