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It would be very easy to do in LR.   However, if you don't know the basic concepts and methods of using LR, it might take u a bit of time/ reading to get up to speed.

The short version is that you would first need to "import" all of your master images into LR. Then, as I said, you would need to make 58 different export profiles (one for each size).  You would start with one, and then simply change the dimensions, give it a new name, and then save it under that new name.  This should go very fast.

Then, in "Library" mode (grid view), select all 100 pix (ie, using control A), and then start going through your list of export profiles. Each time you hit the "export" button, you'll get all 100 pix resized and saved to your HD.

HTH,

Tom M