There're reverse Directories where you can find the address for a phone number, right?
"Syndrome"
Thomas Hoover
I searched various Directories, lists of persons engaged in the Government offices in the Wilhelmstrasse, the Leipzigerstrasse, and Unter den Linden; I consulted the Director of Berlin Police, Von Jagow; the well-known Detective Schunke, and Heinrich Wesener, Assistant-Director of the Secret Service of the General Staff; but nobody knew Karl Krahl.
"The Secrets of Potsdam"
William Le Queux
Morton jerked his head towards the Directories in the bookshelf.
"The Necromancers"
Robert Hugh Benson