A guide to understanding and finding primary sources at the USA Marx Library can be found here.
Concept of Empire: Burke to Attlee, 1774-1947
Early Letters
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English Historical Documents
English Historical Documents, 1906-1939: A Selection
Invisible Immigrants: The Adaptation of English and Scottish Immigrants in Nineteenth-Century America
Parliamentary Diaries of Sir John Trelawny, 1858-1865
Shoulder to Shoulder : A Documentary
Sources of English Constitutional History: A Selection of Documents from A.D. 600 to the Present
They Saw It Happen; an Anthology of Eyewitness’s Accounts of Events in British History, 1689-1897
War Memoirs of David Lloyd George