For those with an interest in such things (after all, it comes around every thirty years or so and has done since the start of photography) might I point you at a collection I scanned some years ago? I inherited these from a godfather nearly thirty years ago, and have no idea of their provenance - other than that most or all are from American vendors dating between 1870 and 1910 or so.
If you have the knack, you can see the stereo image if you let your eyes cross slightly *if* the images are shrunk to fit on centres no wider than your eye spacing - about 60mm works for most. Easiest way is to shrink the window, or view it on a mobile phone... Or print the images at 600dpi is you happen to have an original viewer.
http://stereo.nailed-barnacle.co.uk/#!album-0-69
Some of these are very faded but it's surprising how much information is retained as stereo image.
Neil
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