As a part of Cambridge Information Group, this site is an online store for all sorts of microfilm resources, mainly for libraries or researches of all areas of knowledge. The site mainly sells subscription services, so you can access the database online for a standard fee, and you will be able to find extensive information on antique resources, like full photo and text reproduction of incunabulum (books printed between 1457-500), antique and rare books and journals, papers, prints, illustrations, maps and documents of the western world, but you will also be able to access more contemporary stuff, even from the 20th century and currently produced dissertations, projects, newspapers and magazines.
The Site features several demos and tutorials, so you can learn how to use its advanced search methods, and also how to browse these treasures of human achievement. 
