Henry Shaw published a series of artfully posed photographs of women in the 1920s and sold them as Shaw's Life Studies - A New Series of Original Photographs From Life - To Be Used Instead of the Living Model by Artists and Art Students.
Click here to see two other print ads for sale on Ebay.
Some links to photographs:
Vintage Photographic Images
Lot 334: Henry Shaw Group of Nudes Vintage Silver Prints
Lot 336: Henry Shaw Group of Nudes Vintage Silver Prints
Art Models 5: Life Nude Photos for the Visual Arts
Life Class: The Academic Male Nude, 1820-1920
More images here.