Alan Boris, founder of the Philadelphia Radio Archives, has written a book about the history of Philadelphia radio. Published by Arcadia Publishing in their "Images of America" series, the book is entitled Philadelphia Radio and is available at local bookstores and most online retailers. Visit the author's page for more information.
The newest profile on the Philadelphia Radio Archives is for 102.9 FM, which traces its history back to 1940 and was known for many years as WPEN-FM. After more than 30 years, the WPEN-FM calls returned to the air over 97.5 FM.
User "stevations" has posted a great retrospectve of 1970s Philadelphia airchecks. This is part 4, so be sure to check out the others as well.
Check out my recently updated Flickr Photostream of classic Cherry Hill images.