Newspapers and Magazines
19th Cent Newspapers
Newspapers.com
NewspaperArchive.com
Genealogy Bank
Historic American Newspapers (LOC)
18th Century Journals and Newspapers
Agricultural Newspaper Collection
African American Newspapers
Making of America (Cornell)
Making of America (Michigan)
Harpweek
American Periodical Series Online
America's Historical Newspapers
Historical NY Times
California Digital Newspapers
18th Cent American (LOC)
The Times of London
Sunday Times
Illustrated London News
Marist Historical African American Newspapers
Southern Worker
British Library newspapers
UNZ Review archive

Census Links
Social Explorer
U.S. Census printed volumes
HeritageQuest Online Search Census
Ancestry.com
ICPSR Front Page
US Census Materials: Duke University
National Archives census microfilm
Agricultural Census information
Agricultural Census (Cornell)
Census Online links

Maps
David Rumsey Map Collection
Historical Map
NC Maps
Historical Maps, Hargrett Lib.
Old Maps Online
Social Explorer
NYPL Map Divsion
USGS Hist Topographic Expl.
JCBL maps 
Historic Aerials maps/photos online
Vintage Aerial photos

Alabama
UAB Reynolds Library
UAB Medical Library
Alabama Dept of Archives and History
Birmingham Public Library
Encyclopedia of Alabama
Birmingham newspapers

Arkansas
 Encyclopedia of Arkansas
Arkansas History Commission
Butler Center
U of A Special Collections
Arkansas Historical Quarterly index

General Links
Google
WorldCat
Fondren Catalog
America History and Life
Google Books
Internet Archive
Hathi Trust
Digital Public Library of America
Open Content Alliance
Amazon
Abebooks
Google News Archive
Google Magazine Archive
Chicago Manual
JSTOR
Interlibrary Loan
Lexis Nexis Academic
Proquest Congressional
LofC Lawmaking
Westlaw
NLRB decisions
War Department Papers
Fold3.com
Statutes at Large
Sabin Americana
America's Hist Imprints (Evans; Shaw Shoemaker)
ECCO
Making of the Modern World
Proquest/UMI Digital Dissertations
Open Access Theses and Dissertations
American State Papers
Congressional Biographical Directory
American National Biography
Oxford English Dictionary
Historical Statistics of the US
Nineteenth-Century Index
Readers Guide Retrospective
Eight Centuries
Founders Online
American Presidency Project
American President-Miller Center
History Vault-Black Freedom Struggle
Partisan Review
Colonial America
Archive Grid
Artstor
Avery Index
CarrollGalaxLibrary

Slavery and Reconstruction
Slave Narratives
Slavery, Abolition, and Social Justice
Samuel J. May Anti-Slavery Collection
Slaves and the Courts (LOC)
Ecclesiastical & Secular Sources (Vandy)
Legacies of British Slave-ownership
DocSouth Slave Narratives database
Charles Heartman Collection (Xavier)
Freedpeople ads
Mapping the Freedmen's Bureau
Southern University Slave Narratives
African American Communities
Freedmen's Bureau records

Environmental
FT Energy
FT Commodities
FT Science/Environment
Yale Environment 360
Washington Post environment
New York Times environment
Guardian environment
LA Times environment
Smithsonian Magazine environment
National Geographic environment
Environmental History journal
Bromfield collection
NRCS Soils
NHC Nature Transformed
Old Weather
Global Plants
Water in the West
Texas Legacy Project oral histories
UN Food and Agriculture Org library
Soil Atlas of Africa
Soil Atlas of Europe
Google Timelapse
US Bureau of Reclamation History
Environmental politics bib
Environmental Humanities  
US Env Hist bib
Virginia Wildlife mag archive
LOC Conservation docs
Earth Day/Gaylord Nelson
Aldo Leopold Archives
John Muir Papers
EPA Documerica Photos
EPA Publications
US Fish and Wildlife Service digital collection
American Museum of Nat Hist
Army Corps, Inst. for Water Res.
Sierra Club oral histories
Sierra Club oral histories Berkeley
Selene River Press
EJ atlas
Schumacher Center publications
Bureau of Land Management publications
Gale Environmental History, 1870 to 1980
Whole Earth catalogs
League of Conservation Voters scorecards

Science and Technology
TAIME project
EPA online library system
National Technical Information Service
TRAIL
Energy Office of Scientific and Technical Info
Minerals Yearbook
Biodiversity Heritage Library
EPA Superfund Database
Federal Research Division
USDA National Agricultural Library
Core Historical Literature of Agriculture
U.S. Forest Service
USGS Photos
USGS GNIS
USGS Minerals info
US Government Printing Office
Yellow Fever collection
Oklahoma Academy
Medical Heritage Library
Tobacco Documents
Nutrition Archives
Scientific American

Media
British Pathe and Reuters video
Getty Images
Lantern media history search
CriticalPast video/photo
Travel Film Archive
Media History Digital Library
British Univ. Film and Video Council
Sherman Grinberg Film Library
Old Time Radio
Center for Creative Photography - CCP
American Radio History
Internet Archive: Old Time Radio
Photogrammer
Old Time Radio Researchers
World Radio History

Art digitized
Metropolitan Museum
Getty Museum
Rijksmuseum
National Gallery
Google art project
Guggenheim
Edward Curtis
Textiles Cooper Hewitt

Random
English Short Title
Parliamentary Papers
Women and Social Movements
Early Americas Digital Archive
Civil Rights Digital Library
Commission on Civil Rights
Southern Journey Oral History collection
LOC Civil Rights History Project
Gilder Lehrman Center online documents
National Labor Relations Board
The Library of Congress
Columbia Oral History program
MoMA library
Harvard Univ Open Collections Program
Historical Society of Pennsylvania
Copyright Renewal Database
Stanford Copyright
Wisconsin Magazine of History
Southern Changes back file
Restoration Movement texts
Spiritualist and Occult periodicals
Everyday Life, Women in America
Civil War Letters and Diaries
Civil War diaries
Pennsylvania History
World's Columbian Exposition
Indiana Magazine of History
Indiana University Press
Pittsburgh Press
Michigan Press
California Digital Library
LOC  Digital Special Collections
Library-Archives Catalogs Wis His Soc
NUCMC Home Page
Manuscript Division Finding Aids (LOC)
National Archives
Library of Congress Online Catalogs
Europeana
NYPL Digital Gallery
Yale Digital Content
Cornell Digital Witchcraft
Times Literary Supplement
National Register, NPS
Early Modern Letters
Online Books Page (Penn)
Studs Terkel Archive
Mises Institute publications
Home Economics Archive (HEARTH)