Operation World Prayer Calendar Author:Paul Lewis, Patrick Johnstone, Jason Mandryk 122 countries included. Key statistics, facts and country map. Comprehensive prayer material. Easy-to-use desktop format to prompt regular prayer. Containing clear graphics and useful geographic, cultural, economic and political statistics on 122 countries of the world, the Operation World Prayer Calendar is a fantastic tool to help you ... more »pray intelligently for the world. Pray for each country for three days and see how God works!« less