I'm writing this review with tears in my eyes. Yes, all of nature is sacred, but trees are holy sentinels because they can live for several lifetimes more than other life forms. The bristlecone has an incredible lifespan of thousands of years.
Lanner provides a comprehensive yet accessible overview of the life cycle of bristlecones with a special emphasis on growth rings and how they convey information about rainfall, fires, insect infections, average temperatures, as well as age.
The book has a lot of information, but it also has great illustrations by Marlo Garnsworthy and some pages of very lyric prose as penned by Ronald Lanner.
The book explains the location of these trees, the quality of their wood and resin, their height relative as a seedling to a bird and later relative to a black bear (clever technique), scientists coring techniques for analyzing the rings, their adaptation to changing average temperatures and adaptation to living in high altitudes, etc.
The back matter includes "More About Bristlecone Pine Trees," a glossary of about a dozen words, and acknowledgements. The front inside cover has an annotated illustration of the tree's life cycle; the back inside cover has illustrations of animals that live in the same environment. These creatures appeared within the illustrations, but it's fabulous to have these insects, birds, reptiles, and mammals listed in one place and labeled--including three extinct animals: incredible teratorn, ground sloth, and dire wolf.
I see this book as ideal for young readers ages 8 to 12, but I would read this aloud to younger children and I can see older readers gleaning a lot from reading this book. As I said, I was very moved to be a witness to these trees by reading about them.