The Open Library is an Internet Archive initiative.
From an Open Library Blog Post:
One feature which Open Library has been missing is a way to limit Internet Archive’s full-text search to only include results from books on Open Library. So for the last two years, Open Library has patiently waited to take full advantage of full-text search for its users.
Earlier this week, Gio [Damiola (@giovannidamiola] released an improvement to our full-text search engine which lets us get around this historical limitation — and so we jumped on this opportunity to improve our search on openlibrary.org!
Direct to Open Library
Direct to Open Library “Search Inside” Interface