Dont know if appropiate to recommend a book in this section, but for "readers" it might be a good option.
I found this book published in 2004 and only in spanish in a top B.A. bookstore. Being a Nature and Delta lover i found this book is the best and most comprehensive source of information with excellent pics. of the area.
The author is Silvina Ruiz Moreno de Bunge.
If you are interested in further recomendations on the Tigre Delta area please contact me.
Here is a typical house in Tigre. There lots of them, it's really nice visiting Tigre.
You have also restaurants and plces to visit. You can take a public boat to visiting this places.