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- All images starting with the letter a are from https://www.nga.gov/ and are under the public domain.
- All images starting with the letter b are licensed CC by SA Nathan Salapat
- All images starting with the letter c are from CDC and are public domain. (Potentially only for USA Tax Payers, IDK IANAL)
- All images starting with the letter d are public domain. (copyright is over 100 years old.)
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