| • |
United States -- History -- Sources
(308)
|
| • |
Renewable energy sources
(296)
|
| • |
United States -- History -- Revolution, 1775-1783 -- Sources
(159)
|
| • |
Constitutional history -- United States -- Sources
(140)
|
| • |
Civilization, Western -- History -- Sources
(130)
|
| • |
United States -- History -- Civil War, 1861-1865 -- Sources
(109)
|
| • |
United States -- History -- Colonial period, ca. 1600-1775 -- Sources
(106)
|
| • |
Zionism -- History -- Sources
(101)
|
| • |
United States -- Politics and government -- 1775-1783 -- Sources
(96)
|
| • |
Renewable energy sources -- Congresses
(90)
|
| • |
Great Britain -- History -- Sources
(81)
|
| • |
Renewable energy sources -- United States
(80)
|
| • |
United States -- Politics and government -- Sources
(80)
|
| • |
African Americans -- History -- Sources
(77)
|
| • |
Women -- United States -- History -- Sources
(72)
|
| • |
Church history -- Middle Ages, 600-1500 -- Sources
(69)
|
| • |
World War, 1939-1945 -- Sources
(69)
|
| • |
Shakespeare, William,1564-1616 -- Sources
(68)
|
| • |
Canada -- History -- To 1763 (New France) -- Sources
(67)
|
| • |
United States -- Race relations -- Sources
(67)
|
| • |
United States -- Politics and government -- 1783-1809 -- Sources
(62)
|
| • |
Virginia -- History -- Colonial period, ca. 1600-1775 -- Sources
(62)
|
| • |
Soviet Union -- History -- Revolution, 1917-1921 -- Sources
(60)
|
| • |
Slavery -- United States -- History -- Sources
(58)
|
| • |
African Americans -- Civil rights -- History -- 20th century -- Sources
(56)
|
| • |
England -- Church history -- 1066-1485 -- Sources
(55)
|
| • |
Holocaust, Jewish (1939-1945) -- Sources
(55)
|
| • |
Great Britain -- History -- Elizabeth, 1558-1603 -- Sources
(54)
|
| • |
Women -- England -- History -- 17th century -- Sources
(53)
|
| • |
World War, 1914-1918 -- Sources
(53)
|
