These slides came out of an estate sale of an old retired pilot. I know very little about them and I haven't been able to find anything remotely close to these on the internet. I believe them to be vintage pilot or mechanic training slides for the DC-3/C-47 aircraft. I scanned these with a Nikon coolscan. Please excuse the watermarks, they are not on the original slides. I was using a free version of the software and that's why all of the slide photos are watermarked. If you have any more information that you could share with me about these slides, I would love to hear about it. See picture for more details.