Directories are alphabetical lists of names and addresses. Some German directories list all the adult residents or tradesmen who lived in a town or area at the time the directory was published. The German
Term is "''Adressbuch''", plural "''Adressbücher''".
Address books, AKA city directories, can be a big help when researching in larger towns and cities. Some directories cover a larger, more rural area, such as a Kreis. Others exclude large segments of the population. For example, the city directory of Vienna, Austria, does not list servants and laborers for many years. Some address books only include businesses [like today’s “Yellow Pages”]. It pays to check out the book’s introduction pages.