OAK RIDGE, Tenn. (AP) — A new pocket guide to the city of Oak Ridge and its connections to the Manhattan Project will give visitors a tour of the once secret city.

The guide, which is available now for sale at several locations around the city, is 35 pages and includes a detailed driving tour of heritage sites within the community, along with facts and historical photos from the World War II era.

The Oak Ridger (http://bit.ly/Z0SsPI ) reports that Martin McBride wrote the Oak Ridge Heritage Tour Guide with assistance from longtime city residents. The city became home to a secret federal research lab that helped to build the atomic bomb where more than 100,000 workers built and operated three large nuclear facilities.

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Information from: The Oak Ridger, http://www.oakridger.com