Dinand has many books, both historical and modern, about Worcester that you might want to consult. Most books that address history specifically (or are historical themselves) will be in the section between F74 and F76 (the main exception being atlases, which you will find in G, specifically in G3763.W6).
Books in the F section are located on the mezzanine level of Dinand, on the non-window side (go down the stairs to the side of the Main Reading Room one level, then turn right). If you are browsing, you should be sure to check both the regular section, and the oversized section (call numbers with + in them). The oversized section contains larger books including atlases, some illustrated books, etc. The F+ section is located between the end of the 'regular' Fs, and the start of the 'regular' Gs.