The library's research page serves as a useful point of departure. In addition to this page, the following sections will be useful for this assignment:
A keyword search is probably the easiest way to get started. Once you find some titles that are useful, click on the Library of Congress subject headings to search further.
First check our local holdings on Cruzcat, and if you need to find more books on your topic, move on to Melvyl.
For this assignment, the following subject headings might be useful -- they are just a sample of relevant subject headings that you might want to look at:
Romans-Great Britain
Urbanization-Great Britain-History
Cities and towns, Ancient-Great Britain
Great Britain-History, Roman Period, 55BC-449AD
Great Britain-History, military 55BC-449AD
Iron Age-Great Britain
Rome-Navy
Just to get you started—this is a partial list of relevant resources to which we subscribe.