Here are some sources for old telephone books, which may give you contact information for relatives who are now unlisted.
THIS ARTICLE IS FOR SUBSCRIBERS ONLY
Phone Tapping
By Lisa Louise Cooke
relatedarticles
Case Study: Using Censuses and Directories to Trace an Ancestor
Census Records, Directory
See how I found my hard-to-search, common-named ancestor by browsing the census on researching in city directories on Ancestry.com.Case Study: Using Old Maps and City Directories to Research House History
Maps, Case Studies, Connecticut, Directory, House History, Land
See how our genealogy expert used old maps and city directories to trace the history of a 19th-century home; even…The Genealogist’s Guide to Directories
