In this paper we present the different experimentations we have made on using 3D metaphors to access a digitalized library. Within a library, at least two different tools are required to find, access, read and work on books (a research engine to find the books of interest and a reading environment to work with the chosen ones). We describe and discuss the propositions of 3D metaphors for both aspects taken separately. And to assemble both tasks and smooth the browsing from one tool to the other we also describe some 3D interaction metaphors which provide a continuous navigation.