updated 07/14/2011 AT 11:00 AM ET
•originally published 07/14/2011 AT 11:15 AM ET
Several disturbing home videos of young children frolicking in public, made by Jaycee Dugard’s abductors two decades ago, have been released by the El Dorado County district attorney’s office as part of an attempt to prevent similar tragedies from happening in the future.
Two clips feature young children playing in public in the late ’80s or early ’90s, California’s Mountain Democrat reports.
One shows Phillip Garrido playing a guitar and singing in park, although the camera is focused on the kids playing in the background.
Other documents released this week include a 1972 booking photo of Phillip Garrido and a note signed by Dugard herself.
The Garridos pleaded guilty in April of abducting Dugard in 1991, when she was 11, and holding her for 18 years. She was used as a sex slave and bore Garrido two daughters.
The release of the documents is intended to show how much information the state had on the Garridos – and to try to see how they evaded suspicion and capture for so long.
Last week’s PEOPLE had eight pages of exclusive excerpts from Jaycee Dugard’s memoir and never-before-seen photos