A to Z List of Library Resources: D

From the U.S. General Services Administration, this site provides access to public datasets from across the Federal government. A bit tricky to use, but a gold mine of information.

This collection focuses on rare 18th and 19th century North and South America maps, but there are also maps of the World, Europe, Asia, and Africa. Includes atlases, globes, school geographies, books, maritime charts, and a variety of separate maps.

DOI stands for "Digital Object Identifier." They provide a stable "address" that links to online items and are often included when making a reference citation. This is the "official" source for information about DOIs, including: an Introductory Overview, a long list of Frequently Asked Questions, and the complete DOI Handbook (note: this link uses a DOI).

DPLA provides free, online access to digitized material from America’s libraries, archives, and museums. It covers a wide range of topics, including the written word, works of art and culture, America’s heritage, and science.

This is not the complete DSM-V! It does provide an introduction to it.