Keyword searching ("Any Field" searching) in the library catalog --- and with help from Google Books --- is a good way to start searching. Subject headings for the materials you find from searches in the library catalog can give you ideas for other books on the topics.
You can do subject searches for specific topics, like the examples below (results vary):
City planning -- France – Paris or City planning -- Denmark -- Copenhagen
Transportation -- France -- Paris or Transportation -- Denmark -- Copenhagen Metropolitan Area
Urban renewal -- France -- Paris -- History or Urban renewal -- Denmark
subject contains: sustainability cities
Transportation -- Planning
Important note: Unfortunately, some of the e-books lack subject headings, so remember that this is just one approach, along with other strategies.
