In addition to the title page, the 1930 Plat-Book contains three indices and 48 detailed map plates of the city of Trenton, and 6 detailed map plates and one page containing three indices for the borough of Princeton. This plate contains the three indices for the borough of Princeton. A color Index map delineating the 6 sections of the borough with each section lettered (A-F) to reference its corresponding plate within the Plat-Book. There is also a key explaining building construction, building types, transportation systems, public institutions, parks, cemeteries, etc. The second index is an alphabetical listing of street names referenced to their corresponding plate letters. The third index is of Borough Atlas Plate (B.A.P.) numbers referenced to the corresponding lettered plates.