Photoshop CS5: can I retroactively determine adjustment parameters?

Photoshop CS5: can I retroactively determine adjustment parameters? E.g, the values used when I adjusted brightness/contrast?
I'm running Adobe CS5 on an iMac 24" (OSX 10.6.8).
Ive been working on picture in Photoshop. The first step was an adjustment of brightness/contrast. I can see the several steps I've made in Photoshop's 'history' window, but, although I can do or undo the various levels, I can't determine the values I used at each stage, as there appears to be no info on those values in the history window.
I've been making notes of the subsequent transformations/adjustments, but I didn't remember to do that on the first step. Can I retrieve this info somehow, via history, or some other way?
Thanks, Seb

If you can retrieve the undamaged original image and the image with but that one adjustment applied from the History you should be able to get the values through trial and error.
And if you follow Mylenium’s advice and work non-destructively with Adjustment Layers the task is not that hard.
Use the original image as the lowest Layer, apply a hard Layer Mask to a Layer of the damaged one above that and insert an Adjustment Layer between the two.
Then try various settings until the images match up.
Edit:

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