Newspapers and Magazines
HPL 19th Cent Newspapers
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)
British Newspaper Archive
FreeNewspaperArchives
Newspaper Archives
The Times of London
Illustrated London News
Marist Historical African American Newspapers
Southern Worker
NewspaperArchive.com

Census Links
U.S. Census printed volumes
HeritageQuest Online Search Census
ICPSR Front Page
UVA Historical Census Browser
US Census Materials: Duke University
Agricultural and Manufacturing Census Guide
National Archives census microfilm
Agricultural Census information
Census Online links

Maps
David Rumsey Map Collection
History Map
Historical Map
NC Maps
Historical Maps, Hargrett Lib.
Old Maps Online
Social Explorer

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
Google Books
Internet Archive
Hathi Trust
Digital Public Library of America
Open Content Alliance
Amazon
Abebooks
Google News Archive
WorldCat
Fondren Library
Chicago Manual
Fondren Indexes
America History and Life
JSTOR
OAH Recent Scholarship Online
Interlibrary Loan
Lexis Nexis Academic
Lexis Nexis Congressional
LofC Lawmaking documents
War Department Papers
Statutes at Large
Sabin Americana
Shaw/Shoemaker
ECCO
Making of the Modern World
UMI Digital Dissertations
American State Papers
Congressional Biographical Directory
American National Biography
Oxford English Dictionary
Nineteenth-Century Index
Readers Guide Retrospective
19th Century Masterfile
Founders Online

Slavery
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
Slave Narratives database

Environmental
Yale Environment 360
Washington Post environment
New York Times environment
Guardian environment
LA Times environment
Smithsonian Magazine environment
Environmental History journal
National Geographic environment
Bromfield collection
NRCS Soils
NHC Nature Transformed
Atmospheric Circulation Reconstruction
Old Weather
Global Plants
Water in the West
Texas Legacy Project
FAO Documents
Soil Atlas of Africa
Soil Atlas of Europe
Google Timelapse
USBR History
Environmental politics bib
Environmental Humanities
US Env Hist bib

Science and Technology
TAIME project
EPA online library system
National Technical Information Service
TRAIL
E-print Network
Energy Citation database
Minerals Yearbook
Biodiversity Heritage Library
EPA Superfund Database
Federal Research Division
USDA National Agricultural Library
Core Historical Literature of Agriculture
Farm Credit Archive
U.S. Forest Service
USGS Photos
USGS GNIS
USGS Minerals info
US Government Printing Office
Yellow Fever collection
Oklahoma Academy

Media
Lantern media history search
CriticalPast video/photo
Media History Digital Library
British Univ. Film and Video Council
Old Time Radio
Center for Creative Photography - CCP
American Radio History

Random
AHA Doctoral Program List
English Short Title
Parliamentary Papers
Women and Social Movements
Early Americas Digital Archive
Civil Rights Digital Library
Commission on Civil Rights
LOC Civil Rights History Project
Gilder Lehrman Center online documents
National Labor Relations Board
The Library of Congress
Columbia Oral History program
MoMA | DADABASE
Home Economics Archive (HEARTH)
Harvard Univ Open Collections Program
Historical Society of Pennsylvania
In the First Person
Copyright Renewal Database
Stanford Copyright
Wisconsin Magazine of History
Southern Changes back file
Restoration Movement texts
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
ArchiveGrid
Repositories list
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)