
Bookplate of Rosamond Sturgis Brooks, designed by artist Dorothy Sturgis Harding (1920), lithograph (via Library of Congress, Prints and Photographs Division)
As personal libraries grew in the 19th and 20th centuries, so did bookplates. A way of establishing ownership, the little pasted pieces of paper pressed on inside covers evolved into miniature works of art.
Earlier this month the Library of Congress asked on their blog: “What do bookplates tell us about book owners for whom they were designed?” Sharing a Flickr album of 25 bookplates, they include famed names like actor and filmmaker Charlie Chaplin (Tramp shoes visible in the foreground), artist Frederic Remington (who selected a cow skull), and author Jack London (who chose a wolf), as well as lesser-known individuals who still wanted to give their books a personal flare. The woodcuts, lithographs, engravings, and etchings were selected from the 14,000 bookplates in the Ruthven Deane Collection, collected by a Chicago-based ornithologist between 1910 and 1934.

Bookplate of ornithologist & bookplate collector Ruthven Deane, hand-colored by Mrs. Frank S. Hatch, engraved by Sidney Lawton Smith (1924) (via Library of Congress, Prints and Photographs Division) (click to view larger)
Also known as “ex libris” — Latin for “from the books of,” roughly — bookplates date to at least the 15th century in Germany, although rose into popular fashion four centuries later. Before that was the book rhyme, which was a pithy poem that warned how hurtful stealing the book would be, which followed things like medieval book curses which did the same thing in a more ominous, antagonistic way. Similarly, the 19th and 20th century bookplates often embedded cautions to borrowers, like “the wise return that they again may borrow” or this one with a woe-eyed cat that reads “for loan oft loses both itself & friend.”
Bookplates are a relatively new form of collecting compared to books at large, but can be a significant resource on ownership and art. In addition to the Library of Congress, collections can be found at many literary institutions such as the Sonia Lustig Bookplate Collection at the University of Delaware, including some designed by Albrecht Dürer; the John Starr Stewart Ex Libris Collection at the University of Illinois Library; and the Houghton Library Bookplate Collections at Harvard University that has over 20,000, some which they’ve uploaded and divided into themes like “angling” and coats of arms.
Below are some of the bookplates from the Library of Congress, where the design was often as meaningful to the owner as the book itself.

Bookplate of author Jack London, lithograph (via Library of Congress, Prints and Photographs Division)

Bookplate of Frederic Remington, designed by the artist, lithograph (via Library of Congress, Prints and Photographs Division)

Bookplate of Woodrow Wilson, designed by Carl S. Junge (1910), woodcut (via Library of Congress, Prints and Photographs Division)

Bookplate of Buddy Lankes, designed by Julius J. Lankes (1920), woodcut (via Library of Congress, Prints and Photographs Division)

Bookplate of English caricaturist Phil May, designed by the artist (1895), woodcut (via Library of Congress, Prints and Photographs Division)

Bookplate of Anita Herriman Vedder, Rome, Italy, designed by Elihu Vedder, woodcut (via Library of Congress, Prints and Photographs Division)

Bookplate of Charlie Chaplin, lithograph (via Library of Congress, Prints and Photographs Division)

Bookplate of Newman Erb, railroad executive, etching (via Library of Congress, Prints and Photographs Division)

Bookplate of Bella C. Landauer with “Lend a hand” motto, linocut designed by Sidney Hunt (via Library of Congress, Prints and Photographs Division)

Bookplate of Helen Louise Taylor, Cincinnati, Ohio, wood engraving (via Library of Congress, Prints and Photographs Division)
View more bookplates from the Library of Congress at their online catalogue.
The University of Delaware has a huge collection (12,000+) of bookplates available online, if that’s your kind of thing:
http://www.sscommons.org/openlibrary/welcome.html#3|collections|7729421||UD20Library3A20William20Augustus20Brewer20Bookplate20Collection|||