National Oceanographic and Atmospheric Administration Use to find current and historic US Nautical Charts available for online viewing and for sale.
Library of Congress American Memory Maps Collection Cartographic treasures of the Library of Congress. These images were created from maps and atlases that, in general, are not covered by copyright protection.
Perry Castaneda Map Library The University of Texas's Perry Castaneda Map Library offers digitized versions of more than 44,000 map images (out of 250,000 maps in the printed collection). Images include historical, thematic & topographic maps of the world, continents, countries and states.
Old Maps Online An easy to use portal for digitized historical maps in libraries around the world.
AAPG Datapages The combined search-and-retrieval website for AAPG publications and related collections. Includes full-text and abstracts. Select AAPG from Databases by Title.
List of Soil Surveys by State Use to find county names and dates of print Soil Surveys. Purchase or obtain in the library from the Map or Government Documents Librarians.
Scripps Institution of Oceanography Includes links to hundreds of oceanography sites divided into main categories such as library resources and databases, electronic texts and periodicals, and Internet guides and indexes.