The story behind this book lies with Helia Bravo-Hollis. In the link below is her story from the Cactus Explorer's journal. This is a 1991 volume - the first was written in 1922. Helia Bravo-Hollis was an incredible pioneer for cactus study in Mexico. This edition is in Spanish. Hardcover, 643 pages, a collection of images on photo print in the center. Outstanding treasure, though written completely in Spanish. By Helia Bravo Hollis and Hernando Sanchez Mejorada