This book features a number of classic Beatles tunes arranged for the Mountain Dulcimer by our good friend Neal Hellman.  This book is great for the advanced beginner to intermediate player, and includes chords and tablature for each song, as well as the melody on the staff.  Many songs are in DAD tuning, though some aren't.  
 
Some Beatles songs featured in this book:
All Together Now
Eleanor Rigby
Hey Jude
Let it Be
Norwegian Wood
Yellow Submarine
Yesterday
Plus many more!