David,
George Gamow's book "Thirty years that shook physics" is very
readable and catches the flavor of the period by some one that was there.
Heisenburg also wrote some very readable books on subject, that give some
insite as to how his ideas evolved.
I hope this helps.
Gary
Gary Karshner
St. Mary's University
San Antonio, Texas
KARSHNER@STMARYTX.EDU