Sorry, when you said: “I’d use any picture of Abraham Lincoln by still giving source credit,” you mean you’d use any picture of Abraham Lincoln that is older than 75 years old?
If I may give some examples: this article,
This is Stephen King’s photo, and the author gives the credit. But this photo is actually from Screenrant.com. This in fact shouldn’t be allowed, should it? Though this article is quite popular…
Another one: https://medium.com/lessons-from-history/the-loudest-and-most-devastating-recorded-sound-in-history-af328ae6eff
The 2nd picture of the article is the skeleton of a whale, from the Metropolitan Museum of Art. Is it allowed?
Sorry for throwing so many questions at you, very much appreciate your time!