The British Library
The British Library serves business and industry, researchers, academics and students, in the UK and world-wide. The collection includes well over 150 million items, in most known languages. 3 million new items are added every year and includes manuscripts, maps, newspapers, magazines, prints and drawings, music scores, and patents. They receive a copy of every publication produced in the UK and Ireland.
Worldcat
WorldCat is the world's largest network of library content and services. It allows you to locate a book, video or other item of interest and discover which libraries near you own the item using the zip code search feature. Individual member libraries in your community and elsewhere provide the actual services, such as loaning you a book or providing access to online articles. WorldCat lets you search the collections of libraries in your community and thousands of other libraries around the world.