The Outdoor Girls series does not have a new book coming out soon. The latest book, The Outdoor Girls in Desert Valley (Book 23), was published in January 1933.
The first book in The Outdoor Girls series, The Outdoor Girls of Deepdale; Or, Camping and Tramping for Fun and Health, was published in January 1913.
The Outdoor Girls series primarily falls into the General Fiction genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.