The first 'modern' fashion photography -- photographs of models in poses -- appeared in the April 1911 issue of Art et Decoration with the designs of couturier Paul Poiret photographed by Edward Steichen.
Mr Leetaru began work on the project while researching communications technology at Georgetown University in Washington DC as part of a fellowship sponsored by Yahoo, the owner of photo-sharing service Flickr.
To achieve his goal, Mr Leetaru wrote his own software to work around the way the books had originally been digitised.
The Internet Archive had used an optical character recognition (OCR) program to analyse each of its 600 million scanned pages in order to convert the image of each word into searchable text.
As part of the process, the software recognised which parts of a page were pictures in order to discard them.
Mr Leetaru's code used this information to go back to the original scans, extract the regions the OCR program had ignored, and then save each one as a separate file in the Jpeg picture format.
The software also copied the caption for each image and the text from the paragraphs immediately preceding and following it in the book.
Each Jpeg and its associated text was then posted to a new Flickr page, allowing the public to hunt through the vast catalogue using the site's search tool.