Public domain databases

geographical database

MEDLINE (Medical Literature Analysis and Retrieval System Online, or MEDLARS Online) is a bibliographic database of life sciences and biomedical information. It includes bibliographic information for articles from academic journals covering medicine, nursing, pharmacy, dentistry, veterinary medicine, and health care. MEDLINE also covers much of the literature in biology and biochemistry, as well as fields such as molecular evolution.

database of geographical objects

Pixabay.com is a free stock photography and royalty-free stock media website. It is used for sharing photos, illustrations, vector graphics, film footage, stock music, sound effects, 3D models and animated GIFs, exclusively under the custom Pixabay Content License, which generally allows the free use of the material with some restrictions. The site's images are allowed to be used for free without attribution, and allowed to be modified and adapted into new works. Pixabay does not allow users to sell or distribute the content as is, use it commercially if it contains recognizable trademarks, or

AGRICOLA (AGRICultural OnLine Access) is an online database created and maintained by the United States National Agricultural Library of the United States Department of Agriculture.

US Department of Education online repository

American nonprofit organization

digital library of comic books

public domain geographic data collection

weekly public domain directory published by the United States CIA