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For those who "didn't know" it, Cavaille-Coll organs had 30-note pedal boards and 56-note manuals. This was common in Europe at the time. Also, the pedal boards were flat and non-radiating.
IN the U. S., we are used to the AGO standard dimensions, and they can be looked up and are quite detailed. But that doesn't mean they are "standard" everywhere.
The five-octave manuals seem to have become pretty much the rule nearly everywhere now, but figure up how many more pipes that means, depending on the number of ranks an instrument has available.
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