Simplify the following text for a Grade 10 native English-speaking person.
Original: Both the Hay and Nicolay copies of the Address are within the Library of Congress , encased in specially designed , temperature-controlled , sealed containers with argon gas in order to protect the documents from oxidation and continued deterioration .
Simplified: Both the Hay and Nicolay copies of the Address are inside the Library of Congress . They are inside specially designed , temperature-controlled , sealed containers with argon gas .