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Hathitrust is persnickety if you are not assosciated with a university or other "partner". You can download one page at a time (if you are not geo-restricted from that particular file). I download the page, and then use one of the online pdf services to extract the image from that saved one-page pdf file. I use pdfaid.com, and extract to PNG. Quality of images is usually a little larger and clearer to work with than using a screen-shot.
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