2) The Definitive Measure of Growth: World Christian Encyclopedia (3rd Ed.)

Here’s a reference work that spans the world — and a generation. It will also likely be the heaviest book (literally) in your entire library. Every country, every denomination, and every possible measurement under the sun. If Todd Johnson didn’t chronicle it (with Gina’s help), it probably didn’t happen. https://www.amazon.com/World-Christian-Encyclopedia-Johnson-Todd/dp/1474403239 (Thanks, Marti, for bubbling this up in Missions Catalyst!)