"For me it tends to be more a matter of finding the links between things. I need to fill out my knowledge of Prague, 1949, or the Elizabethan prose writers, or the cross-migration between New York newspapers and Hollywood in the '20s and '30s. I buy every book I see about Gypsies, and most firsthand accounts of vaudeville, and almost everything by lesser-known New Yorker writers of the old regime. I'm always on the lookout for memoirs -- frequently by the less-than-famous -- that supply concrete details of daily life, rather than simply lists of names or dates of parties or, heaven forfend, litanies of traumas. I like books published before 1940 that are illustrated with photographs; even if those are frequently small and murky, they are rare windows into the past. Books help me construct whole worlds in my mind, and I require an army of books to complete the picture, not that it's ever truly complete."