"These Were the Vaqueros" Collected Works of Arnold R. Rojas. Simply the best book ever written on the subject.
The Saga of Rancho Tejon by Frank Latta
Conquerors, the Roots of New World Horsemanship by Dr. Deb Bennett
The Horse of the Americas by Robert Denhardt
American Indian Horse Masks by Ned & Jody Martin (directly related to Spanish introduction of the horse to the Americas, and a fabulous book) www.hawkhillpress.com
Right -- Bits & spurs were tools of the trade, but in the vaquero tradition, they were also works of art. Some of the finest artisans are honored in this beautiful book, which features hundreds of colored plates of their work, as well as a short history of the evolution of the unique "Californio" style.