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Make a disk image of the SD card on your hard drive first to separate the data from the physical medium itself. Then there are data-recovery/forensic tools to extract stuff from the disk image. I haven't done this in several years and cannot recall what software I used to do it but it's not hard (just a bit tedious). But really the most important thing is to save an image of the card and not use the card till you do that. You can worry about the rest later. Software you need is freely available, just google (or wait for more helpful reply).
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