The Sketchbook Project is a unique Brooklyn-based global arts initiative that's been operating for the past ten years. Anyone who wants to participate buys one of their pocket sketchbooks. You fill the book up with your art, send it back, they scan it and make it available online. It also goes into their collection (now over 33,000 volumes) which the public can access, and there's even a mobile museum touring the collection.
The Sketchbook Project World Tour is the latest collection of the project's sketchbooks. The project now gets submissions from some 135 countries. This 224-page book is divided into six continents with each section including an introduction, interviews with a few of the contributing artists, and numerous examples of the sketchbooks from that area of the world. The quality and styles of the work vary greatly. I see this as a strength, a sort of anyone-can-play "zine" mentality that I appreciate. But your mileage may vary. If you're interested in the Sketchbook Project itself, you can find out more here.
The Sketchbook Project World Tour
by Steven Peterman and Sara Elands Peterman
Princeton Architectural Press
2015, 256 pages, 8.2 x 10.2 x 1.0 inches (paperback)
$21 Buy a copy on Amazon