This is a 42 page souvenir booklet for the Fountain of Youth. It’s copyrighted by Carita Doggett Corse in 1939.
It was written by Carita Doggett Corse who was an storyteller and historian with several publications to her name including one on the story of Silver Springs called Shrine of the Water Gods.
The brochure tells the history of the Fountain of Youth and St. Augustine as was known in the early 20th century. It may be best to take the information it shares with a grain of salt today.