Marimba for Four, An Introduction to Four-Mallet Marimba Technique - 32 pages; grip, exercises, etudes, for beginners, 6 short solos easy to intermediate; Text engl.
If you're wanting a concise method for learning four mallet technique on marimba, here it is!
Covering the Musser/Stevens grip and including strokes, exercises, etudes and solos... Mr. Steinquest has put together a fantastic kick-starter for those interested in the "four mallet world". (instructional video content available.)