Removing 1920's cast iron kitchen sink

We have the plumbing figured out, but our problem is is that there seems to be something holding the back of the sink to the wall. A friend said there may very well be bolts holding it...if this is the case, where approx would they be & how would we go about unbolting it? I sure would hate to resort to busting it up just to get it out.
q removing 1920 s cast iron kitchen sink, bathroom ideas, diy, how to, kitchen design
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