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SAMPLE AUDIO SOURCES

• Internet Archive Greatest Speeches of the 20th Century

SAMPLE IMAGE SOURCES

• LIFE Photo Archive From Google
• Public Domain Images
• Morgue File
• Pixabay

SAMPLE VIDEO SOURCES

• Documentary Heaven
• Movies Found Online
• National Geographic
• The National Science Digital Library
• NBC Learn
• PBS Videos
• TED
• Top Documentary Films
• The Moving Image Archive

SAMPLE LOW-COST OR FREE (OPEN) TEXTBOOK AND EBOOK SOURCES

• Project Gutenberg
• Textbook Revolution
• Wikibooks