Interesting concept but judging from a couple searches some of the publishers are not maintaining links.
"The Bibliovault repository contains a growing collection of older, recently published, and new books from participating scholarly presses." Search subject, author, title, or full-text. It's not a large collection as yet, but an interesting one that can shed light on current issues. A search on New Orleans yielded some fascinating stuff on its history, politics, poverty, and race relations.