Columbia University EdX Online Course - Global Muckraking

Hi all. Seen some credits for a few P5 photos in a Columbia University online course lecture on EdX. The course is Global Muckraking and this is the trailer. https://www.youtube.com/watch?v=-5J7_bOWMp4. Didn't post the actual lecture video as it is unlisted.

These are the clips credited.
037816939 Open Mining Pit
040701069 Open Mining Pit
053619983 Huge Mining Machine Coal Mine
028555134 Mining Coal Open Pit Mine Heav
035542901 No Mining Protest New Zealand
020431350 Sulfur Mining Plant