UC Cooperative Extension Frost Protection Training Units
Each of the two websites below contain four narrated training units on frost protection. Identical information is presented in English and Spanish. All presentations are viewable online in Flash format; you will need audio on your computer to hear the narration.
Food and Agriculture Organization Frost Publication - 2005
From the Abstract: "Although this book contains considerable technical information, it was specifically written for growers rather than scientists as a practical guide for frost protection."
Volume I is available free online.
Frost Protection: fundamentals, practice, and economics
Authors: Richard Snyder, UC Davis and J.Paulo de Melo-Abreu, Technical University of Lisbon