Information about Pennsylvania:
http://atozkidsstuff.com/pennsylvania.html
http://www.enchantedlearning.com/usa/states/pennsylvania/
http://www.ducksters.com/geography/state.php?State=Pennsylvania
http://www.newworldencyclopedia.org/entry/Pennsylvania
Information about San Diego Zoo:
http://www.ducksters.com/history/battle_of_gettysburg.php
http://www.civil-conflict.org/civil-war-battles/battle-of-gettysburg.htm
http://www.softschools.com/facts/civil_war/battle_of_gettysburg_facts/864/
