Jill Keppeler 
Team Time Machine Crashes the Constitutional Convention [PDF ebook] 

In mid-1787, some famous and important Americans gathered in Philadelphia, Pennsylvania. They meant to amend the Articles of Confederation, but three young time travelers know they’ll really be creating a whole new constitution for the United States! Gaby, Zoe, and Will visit the Philadelphia State House, take sides in the great debate over this important document, and witness the signing of the U.S. Constitution. Humor and adventure mix with important historical information. Color photographs and illustrations give readers a further glimpse into the past.