Paperback
(Random House Books for Young Readers, April 30, 1991)
In 1913 young Indiana Jones finds an ancient silver ring that may have belonged to King Arthur, investigates sabotage of a Welsh friend's coal mines, and travels back in time to solve a crisis in the present
Hardcover
(Random House Books for Young Readers, June 11, 1991)
In 1913 young Indiana Jones finds an ancient silver ring that may have belonged to King Arthur, investigates sabotage of a Welsh friend's coal mines, and travels back in time to solve a crisis in the present