Below are several existing digital collections to evaluate.

ACM Digital Library

Alex Catalogue of Electronic Texts

California Digital Library

Cornell University Library Windows on the Past

David Rumsey Map Collection

Digital Library of Appalachia

The Hermitage Museum

International Children’s Digital Library

International Coalition of Library Consortia

Internet Archive

The Internet Public Library

Library of Congress American Memory Project

Library of Congress Thomas Project

LOUISiana Digital Library

Project Gutenberg

Milwaukee Public Library Digital Collections

NASA Images

The National Science Digital Library

Perseus Digital Library

UCLA Digital Collections

World Digital Library

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