The National Library of Scotland now has now reached over 700 digitized post office directories posted online. These directories cover most of Scotland and date from 1773 to 1911. The directories list alphabetically the name of the inhabitants, their address and often their profession. Access is free. With their alphabetical list of a location's inhabitants and information on their profession and address, the directories enable you easily to find out where people lived at a certain time and how they earned their living.