A 1939 NBC photo could not be located.
Image: “Pauline Frederick Reports,” ABC news radio, circa 1940*. Photograph by Charles Kanarian for ABC News. http://www.smith.edu/libraries/digitalcollections/pauline-frederick
Pauline Frederick was a feature writer for newspapers and magazines from late 1930s. “She broke into broadcasting in 1939 when NBC’s director of women’s programs, Margaret Cuthbert, asked her to interview the wife of the Czechoslovakian minister shortly after Germany overran that country.”
Excerpt is from an article by Louise Benjamin: http://www.museum.tv/eotv/frederickpa.htm .
As a woman in a male-dominated field, Frederick overcame many obstacles as described at the link.
*most likely, this photo dates from 1946 as she was working for NBC until 1945.