I saw an article recently that explained that about half of what propelled Marilyn Monroe's career was the amount of publicity she got in magazines.
It was shots like this, as much as her movie work, which helped ctreat the legend.

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"Young upcoming Hollywood starlet Marilyn Monroe practicing in dance class." Photo by J.R. Eyerman.

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Also 1947. "Movie starlet Marilyn Monroe." And the world's luckiest phone book.