Per 
003: https://tineye.com/search/6b7c80e680cae422a3a63cba2d3b6167b98406ca/?page=1&sort=crawl_date&order=asc
Earliest crawl is edithis, but notable in that the filename from its usage on a university site suggests that it was from from freefoto.com (though tineye did not find it there). Thus, it might be CC but just with the original removed from the site.
004: Tineye only found fairly recent results for this one, source unknown.
Alt Image: http://www.publicdomainpictures.net/view-image.php?image=87955&picture=rustic-red-wooden-door
008: Earliest source on tineye is editthis
Alt image: https://commons.wikimedia.org/wiki/File:TPI1_structure.png
009: Earliest is us
011: Found on a lot of vermont websites, didn't see any permissions
Alt Image: https://commons.wikimedia.org/wiki/File:Memorial_to_American_Civil_War_veterans_in_Bethel,_Maine.jpg
014: Earliest is us
Alt Image:
015: Earliest is us
017: Tineye couldn't search
Alt Image: Too specific
019: Found on a "colonial voyage website" says its from British museum.
020 https://tineye.com/search/17e569d5a2507fadf2a726913f1526e20b110e8c/
Earliest source appears to be a msnbc story. The other image with the rashes is just from us.
Alt images: https://www.flickr.com/photos/70237334@N04/6379728773 for the mold
and: https://commons.wikimedia.org/wiki/File:Amoxicillin_rash_11_hours_after_17th_dose.JPG for the rashes
022: https://tineye.com/search/f5341c85033b7dfad2c0e3f8fb9f0cf8aa87fd0d/
Earliest image is from a dead link, appears to have been edited to use as a stock image for anti health care reform press releases. That variant is the one used here.
Alt image: https://www.flickr.com/photos/pavel/3210856792
035: an iconic gif, can't be easily replaced.
039: originated on a now defunct Australian wildlife website.
Alt image: https://commons.wikimedia.org/wiki/File:Proboscis_monkey_(Nasalis_larvatus)_male_head.jpg But needs someone to photoshop the eyes out.
042: earliest is us
Alt image: http://maxpixel.freegreatpicture.com/Thoroughbred-Arabian-Grass-Mold-Horse-Horse-Head-1648730
043: Tineye can't search due to how simple it is.
046: Earliest is us.
047: Earliest source: https://www.flickr.com/photos/subseasniper/3984264339/ All rights reserved, so def not CC
Alt image: Pefunctory search did not find image approximating the original's likeness.
049: Earliest source was some german blog, but that was after it was posted here so original is unknown.
Alt Image: Iconic, would likely need an artist to photoshop or make a digital art piece or something.
50: https://www.amazon.com/ACG-Studying-Monkey-Statue/dp/B000GCDMSE source is Amazon.
Alt image: Due to the specific nature of the product and description, a perfunctory search yielded no alt images that fit the bill.
52: earliest is us
Alt Image: Replacing this one is difficult, as images of NY subway cars usually don't fit the time frame, have people in the picture, or aren't labeled as an A train as per the description.
53: http://www.f1online.pro/en/image-details/798604.html this is from an image sale site, yikes, we better take this one down quick.
067: Earliest for both is us
Alt Image: Hyperspecific description renders finding a replacement difficult
081: Image is from a now defunct ghosthunting website
Alt image: nature of the photo makes it hard to find an alt image that doesn't violate our gore policy or accurately reflect the original.
084: Earliest is from us for both. Gears says in comments he found the tower image from a random Google search, so it almost certainly isn't compliant.
Alt image: https://upload.wikimedia.org/wikipedia/commons/b/b6/Hoyt_Radio_Tower.JPG, https://pixabay.com/p-550560/?no_redirect potential options, would need photoshopping
085: Drawn by Yubi Shines, as far as I can tell. Can possibly be contacted at https://yubishines.dreamwidth.org/profile. TinEye can't find anything.
Alt image: Would be easy for an artist to make a new one.
086: Earliest is us.
Alt image: https://commons.wikimedia.org/wiki/File:Rotaryphone2.JPG
087: Earliest is us. Supposedly images were made by Zaeyde, we should contact her if able to find out if she has sources.
Alt image: Iconic. Picture of stairwell to be photoshopped not found with perfunctory search.
088: First image is CC BY-NC-SA 3.0 from http://pinktentacle.com/2009/03/monster-mummies-of-japan/ as mentioned by anqxyr in comments. Would likely need a tag similar to 173, but usable. Second image is from Los Angeles Times http://latimesblogs.latimes.com/thedailymirror/2009/04/did-weird-cult-carve-tunnels-under-los-angeles-jan-29-1934.html and won't be CC until 2033.
Alt image:
089: Image is from https://en.wikipedia.org/wiki/Cabiria, a 1914 movie which is PD. Image should be good, although Accelerando noted in the comments in 2014: "Scratch that. Actually, if it's a picture that someone took, then it's not under Public Domain. The Image Team will look into this." no follow up, as far as I can tell, so possible image was cleared then.
Alt image: N/A
093: No image despite having the _image tag. Tag should probably be removed.
098: First source is offsite, but 404. All further sources are after the article's posting.
Alt image: CC-BY-SA 4.0
099: First source is offsite, image is fair use.
Alt image: Would require partial rewrite of page. Most paintings depicting people would be eligible.
100: No sources prior to article's posting. Author no longer present.
Alt image: Would require partial rewrite of page.
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