How can I find wartime cartoons reprinted in published books?

1.  Start somewhere with key words or phrases. For example, in the Library catalog, try an advanced search for  "world war II" (subject)  and "cartoons" (anywhere). (result=92) 

2. Keep expanding and refining your key words as you discover more sources.

3.  Notice and use LC subject headings.

World War, 1939-1945 > Caricatures and cartoons.
War > Comic books, strips, etc.
Comic books, strips, etc. > United States > History and criticism.
Comics (Graphic works)

World politics > 1900-1945 > Caricatures and cartoons.
United States > Politics and government > 1933-1945 > Caricatures and cartoons.
Editorial cartoons > United States > History > 20th century.
American wit and humor, Pictorial.

4.  Find books; use subject headings to find more books and identify new keywords.

5. Use facets in library catalog to limit your results to books online. (Facets are on the left side of the screen.)

Dr. Seuss & Co. Go To War

The World War: The Cartoonists' Vision

New Yorker War Album 1942

Russian wit and humor. with illustrations

Jeeps & Jests

Cartoons: digital archives

Dr. Seuss Went to War., University of California San Diego Library.

Billy Ireland Cartoon Library and Museum, Ohio State University Libraries,

Persuasive Cartography: The P.J. Mode Collection, Cornell University Libraries 

How can I find political cartoons?

The Library Research Guide Unexpected Images  includes a page on Political Cartoons with extensive links;  highly recommended!