From The New York Public Library Digital Collections:
Despite the fact that dust jackets often include useful information about a book and its author, including biographical notes and often a portrait, it has long been Research Libraries practice to remove the jackets from new books during processing for their permanent place in the stacks. However, from 1926 to 1947, anonymous librarians selected and saved interesting jackets from books of all sorts. Arranged roughly by date published/acquired, these paper covers eventually filled the 22 large scrapbooks presented here. This digital collection offers, first, a view of each jacket’s front, spine, and inside flap; jacket backs and flaps may be viewed by clicking the “View Verso” button on the “image details” pages.
The jackets in the collection are from books published in the United States and Europe during two turbulent decades.
Link to the rest at The New York Public Library