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Scroll down to Media and try:

Try filtering your searches -

For example

• Search with an exact phrase - "lewis hine"
• For free images that do not have copyright restrictions:
  • ​Select Search Tools
  • Select Usage Rights
  • Select Labeled for noncommerical reuse
• You can also go to http://www.google.com/advanced_search
  • Scroll down to usage rights and select free to use or share