Donald A. Wilhite 
Droughts [PDF ebook] 
A Global Assesment

Drought draws together contributions from over 75 leading international researchers in the field to present the most comprehensive body of research on the physical and social dimensions of drought to date. Including an extensive range of case-studies covering the most drought-prone and most affected countries, the contributors examine new technology, planning methodologies and mitigation actions from recent drought experiences worldwide.
Following a discussion of the critical concepts of drought, the work is divided into the following additional parts:
· causes and predictability
· monitoring and early warning techniques
· impacts and assessment methodologies
· links between drought and other global issues
· conclusions and future challenges