It Happened In... (1992–2011) — book series in order

Manyebook

It Happened in Montana (1992)
It Happened in Arizona (1994)
It Happened in Texas (1996)
It Happened in Georgia (2000)
It Happened in Oklahoma (2006)
It Happened at Grand Canyon (2007)
It Happened in Colorado (2007)
It Happened in Washington (2007)
It Happened on the Underground Railroad (2007)
It Happened in Rocky Mountain National Park (2008)
It Happened in Seattle (2009)
It Happened in Ohio (2010)
It Happened in Michigan (2011)