By John McDevitt

PHILADELPHIA (CBS) – A five-day library conference wrapped up Saturday in Philadelphia, bringing an estimated $20 million plus to the local economy. A well-known entertainer and author closed the convention.

Ninety-year-old Betty White was at the 2012 Public Library Association’s conference and talked about her work with animals and her nearly 70-year career in show business including her show “Hot in Cleveland.”

White surrounded by security, signed copies of her books including the latest, “Betty and Friends: My Life at the Zoo.”

The event drew in thousands of librarians, library professionals, authors, publishers and library vendors from across the country and around the world.

Top Content On CBSPhilly

Watch & Listen LIVE