The Parker Story, available through The Double Gun Journal, is the best Parker reference book.
Also, see this website's home page for an example catalog page which contains a description.
Twist barrels are not supposed to be blued.
You should check your barrels with a bore mic to see if they have been honed, and if they have, with a wall thickness gauge to determine whether there is adequate wall thickness remaining. Its best to do that before purchase.
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