If you are fully on-board with the interest in ancient giants, I have a lot of books to suggest you read. I will divide them up based on what you're looking for -
Best overall giants book
The Ancient Giants Who Ruled America: The Missing Skeletons and the Great Smithsonian Cover-Up by Richard Dewhurst. I guarantee you will not put the book down and will refer to it often. If you only want to invest in one book about giants - this is your book!
Best Historic Account About Giants In the Mid Atlantic US
The Natural and Aboriginal History of Tennessee by John Haywood. Originally published in 1923, and speaks readily about the bones uncovered that were of gigantic stature.
Best book for those interested in Lovelock Cave
"Stone Age in the Great Basin" by Emory Strong. This is a wonderful accounting of the way of life of the Native people of the Great Basin area, their history and their legends, including encounters with the red-haired giants.
Best Book Chronicling Worldwide Unusual Technology and Ancient Finds
Fingerprints Of the Gods by Graham Hancock.
Best Historic Account of Giant Natives in Florida and Texas America
The Narrative of Cabeza de Vaca by Alvar Nunez Cabeza de Vaca
The Best Archaeological Details About Ancient Giants
The Nephilim Chronicles: Fallen Angels In the Ohio Valley by Fritz Zimmerman
Certain Mounds and Village Sites In Ohio by William Corless Mills
Best Worldwide Explanations For Giants
Lost Race of the Giants by Patrick Chouinard.
Best book about a totally screwed up handling of a significant find by Army Corp of Engineers
Their Skeletons Speak: Kennewick Man and the Paleoamerican World by Sally Walker and Douglas Owsley
Best Book about Death Valley Finds
Death Valley Men by Bourke Lee. This is not an easy book to find - out of print, and quite expensive. I did buy it and read the passages about the giants on a 6-part video series on YouTube