(W/A/CA) Don Rosa Scrooge McDuck risks destroying the planet when he thinks a serum that can bore through any surface might instantly dig mineshafts but instead he drills a tunnel straight into the Earth's core. Also included are 'Hearts Of The Yukon' and 'The Lost Charts of Columbus' plus more! Presented in brilliant color with a treasure trove of Rosa's cover art and behind-the-scenes factoids. Also available is a new boxed set of this volume and last season's Vol. 5!