Yordaddy,
Sorry for the late reply, but I had to contact the person that inherited her Uncle's books. He looked around and could not find it. We had a discussion on the title of the book; he thinks it may have been called The Karankawa Coast. I looked on line and found some links to a book that I think may have been the one I was thinking of. It is by Edward W. Kilman, and originally published in 1959. Here's a link to the book on the Internet Archive, Open Library:
Cannibal Coast linkUnfortunately, it appears the book isn't available there.
Here is a picture from Pinterest of the cover. It isn't what I remember though. i thought the book was white with gold figures similar to the color version shown here. This may be the dust cover of the book and not the actual book itself.

The following is a list of books they could find, along with the author, copyright or published date and publisher. Where available, he included the price of the book with the rest of the information. I hope you can find some of them, at least on line. The last book is one my wife bought as we were going to Rockport quite a bit in those days and some of them were in Rockport.
PamphletsThe Crabs of Texas, by Sandra Pounds Leary, with illustrations
Bulletin No. 13, Series VII, Coastal Fisheries, 1961/Revised 1964/Printed 1967
Published by Texas Parks and Wildlife Department
Taming The Texas Coast, by Vernon Smylie
First revised edition, Copyrights 1965
Published by Texas News Syndicate ($1.00)
The Secrets of Padre Island, An Informal History of America's Most Fascinating Island (From 1845 to Present), by Vernon Smylie
First printing, Copyright 1964
Published by Texas News Syndicate ($1.00)
Conquistadores and Cannibals, The Early History of Padre Island (1519-1845), by Vernon Smylie
First printing, Copyright 1964
Published by Texas News Syndicate ($1.00)
This is Padre Island, Land of Fantasy, Fun Treasure and Adventure, by Vernon Smylie
First printing, Copyright 1964
Published by Texas News Syndicate ($1.00)
The Padre Island Story, by Loraine Daly and Pat Reumert
Copyright 1962
The Naylor Company
Books (hardbacks)Fishing Yesterday's Gulf Coast, by Legendary Guide Barney Farley
Number Three, Gulf Coast Studies, Sponsored by Texas A&M University Corpus Christi
Copyright 2002
Texas A&M University Press
Fishing Yesterday's Gulf Coast, by Legendary Guide Barney Farley
Number Three, Gulf Coast Studies, Sponsored by Texas A&M University Corpus Christi
Copyright 2002
Texas A&M University Press
The Stubborn Fisherman, by Elda May Roberts
Copyright 1970
The Altus Printing Company ($6.95)
Padre Island, Treasure Kingdom of the World, by William Mahan
Copyright 1967
Texian Press ($6.95)
Hurricane Junction, A History of Port Aransas, by Cyril Matthew Kuehne
Copyright 1973
St. Mary's University
Added book (not from the Uncle's library)
Ghosts Along the Texas Coast, by Docia Schultz Williams
Copyright 1995
Republic of Texas Press ($12.95)
Good luck with your search for books.