San Diego City & County Directory 1904 Almanacs, post office and trade directories are useful for tracing the addresses and movements of ancestors. A listing in the directory can help to confirm a person’s whereabouts at a certain time, just as a sudden disappearance from the directory can provide a clue about the date of a person’s death. You can find information in Trade and professional directories about occupations, and some post office directories also include categories such as ecclesiastical, educational and pastoral directories. Viewable on any computer (PC and Mac) using Adobe Acrobat Reader. This is one of a range of old and rare books scanned onto CD by The Genealogy Store