 In general, the Princeton editions are not available for sale in The Commonwealth, except for Canada, and the Routledge editions are not available for sale in the U.S.A.There are many differences in publication dates between the Princeton and Routledge series, as well as some differences in edition numbers and the styling of titles; there are also various hardback and paperback versions, as well as some ebooks, available from both publishers, each with its own ISBN.This article shows dates and titles for hardback (cloth) volumes in the catalog of the Princeton University Press, which also includes paperback and ebook versions.