Old documents can be found in various places such as libraries, archives, online databases, and personal collections. You can also try contacting organizations or individuals who may have the documents you are looking for.
Authenticity can be determined by examining the document for any signs of tampering or forgery. You can also compare the document with other known authentic documents from the same time period or consult experts for their opinion.
The best way to preserve old documents is to store them in a cool and dry environment, away from direct sunlight and humidity. It is also important to handle them with clean hands or gloves and avoid using any adhesive materials on them.
If the old documents you are looking for are not available online, you can try visiting libraries or archives that hold physical copies. You can also contact the organization or individual who owns the documents and inquire about access.
It depends on the copyright laws and policies of the organization or individual who owns the documents. In most cases, you may be able to make copies for personal or educational use, but commercial use may require permission or a fee.