S. M. Sterling's The Change Series
The Change series contains these 2 series.
Nantucket series:
Book #1/1; Island in the Sea of Time (1998-03-01)
Book #2/2; Against the Tide of Years (1999-05-01)
Book #3/3; On the Oceans of Eternity (2000-04-01)
The Emberverse series:
Book #4/1; Dies the Fire (2004-07-01)
Book #5/2; The Protector's War (2005-09-06)
Book #6/3; A Meeting at Corvallis (2006-09-05)
A second tetralogy, set 22 years after the Change, is in progress:
Book #7/4; The Sunrise Lands (2007-09-04)
Book #8/5; The Scourge of God (2008-09-02)
Book #9/6; The Sword of the Lady (2009)
Book #10/7; The High King of Montival (2010)
