I am having a hard time finding copies on the internet of papers written by some people in the past. People such as Thomas Young, James Clerk Maxwell, Wilhelm Rontgen, Heinrich Hertz.... any one know where to look to find the papers that these people wrote?? Thanks.
Search. I did a quick one for Maxwell- his are available both in a pretty cheap Dover Kindle edition, and Cambridge has them online here: https://www.cambridge.org/core/books/scientific-papers-of-james-clerk-maxwell/6C1B3B403BBCBC9B5CBB72256F09127F. Looks like you need a library or institutional affiliation, though.
However, just because it's online doesn't mean it's going to be a bargain. Michael Faraday's voluminous writings can be downloaded, but his letters at least come at a pretty hefty price. https://www.rigb.org/our-history/michael-faraday/papers