Be on the lookout for these sf and fantasy books stolen in August 2012 from Temple University Libraries’ Science Fiction and Fantasy Collection:
Asimov, Isaac. Currents of Space. 1952. First edition.
Asimov, Isaac. Foundation. 1951. First, with d.j.
Asimov, Isaac. Foundation and Empire. 1952. First, with d.j.
Burroughs, Edgar Rice. Tarzan of the Apes. Chicago, McClurg, 1914. 1st.
Dick, Philip. Do Androids Dream of Electric Sheep? 1968. First, d.j.
Lovecraft, H. P. Beyond the Wall of Sleep. Arkham House, 1943. d.j.
Lovecraft, H. P. Notes and Commonplace Book… 1938.
Lovecraft, H. P. The Outsider and Others. Arkham House, 1939.
Lovecraft, H. P. The Shunned House. Recluse Press, 1928.
Verne, Jules. 7 Hetzel editions:
Claudius Bombarnac … [1892?]
L’ile Mysterieuse .. [1875?]
Mathias Sandorf. 1885.
Mirifiques Aventures de Maitre Antifer. 
Le Tour du Monde en Quatre-vingts Jours. [1890?]
Une Ville Flottante …. 1872.
After seeing what’s on the list, I suggest that if everyone in Philadelphia keeps a close eye on their copies of Asimov’s Second Foundation the miscreant will be caught when he tries to find out how the story ends.
Seriously, if you have information about these volumes please contact either Thomas M. Whitehead, Rare Books & Literary Manuscripts, at firstname.lastname@example.org, or Margery Sly, Director of Special Collections, at email@example.com. 215-204-8230 and 215-204-1455 respectively.
[Thanks to John King Tarpinian for the story.]