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Attributions

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

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Photo Credits

This is a list of the open source photography used in the text. Unless otherwise noted, the photographs are licensed CC0 or public domain.

Unit 1

Unit 2

Unit 3

Unit 4