Materials in RBSC are most frequently arranged according to their subject matter, source, and document type and size; maps, books, A/V materials, framed artwork and archives are usually all kept in different locations. This means that collections are sometimes split up or rearranged. Collections that were acquired by RBSC at different times when standards varied may or may not be catalogued in such a way that is easy to "collocate" collections. There are a few strategies that can be used in order to get an idea of the entirety of many of our collections.