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Education users
Professors, students and teachers are free to use it in classroom presentations and demos, dissertations and other non-commercial academic works, researches and all related not-for-profit activities. The use of our files is still bound by a license but its use is completely free as long as:
(1) the downloaded image is used according to its terms and conditions;
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(3) it is not distributed to third parties.
via http://www.freetech4teachers.com/2012/04/humanline-thousands-of-historic-images.html
20 slides for 20 seconds each totalling 6 minutes and 40 seconds for a presentation Pecha Kucha style. Alan Levine has provided this great service for our enjoyment.