The state of Indiana has an important, recognized connection to the Lewis and Clark Expedition. That connection is reinforced with a National Signature Event in Clarksville (Indiana) during October 2003. Until the expedition party left its winter camp in May 1804, it remained in Indiana Territory, governed from Vincennes (Indiana) by William Henry Harrison. The specific focus of this issue of "The Indiana Historian" is Indiana connections that is organized around a timeline unit. The unit includes maps, biographical sketches, excerpts from letters, and newspaper articles that enlarge upon the timeline. Timeline references and other selected materials are intended to enhance student understanding about the importance of the Falls of the Ohio area at the beginning of the expedition and its part at the end. The references are also intended to indicate the involvement of Governor Harrison and Indiana Territory in the expedition. An essay "Extending America's Reach" provides a brief overview of the context of the expedition, interactions with American Indians, and Thomas Jefferson's vision. Contains a 10-item annotated bibliography. Also lists four additional resources and eight Internet resources. (BT)