No, that's the problem. Pre-AI era content a) is often not dated, so not identifiable as such, and b) also gets out of date. What was thought to be true 20 ye

No, that's the problem. Pre-AI era content a) is often not dated, so not identifiable as such, and b) also gets out of date. What was thought to be true 20 years ago might not be thought to be true today. Search for the "half-life of facts".