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Referencing ProDOS Error Messages in Memory

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I hope I haven't asked this before...

In the "online" program I wrote last year (https://github.com/gungwald/online), I included definitions of ProDOS error messages. But, it seems like these have to be in the ProDOS code which is already loaded into memory, so that I could reference them rather than defining them myself. Does anyone know where these might be in memory so that I can reference them, and/or how I would go about finding them?

I feel like the AppleWin debugger might be helpful in finding them, if I could only understand how to use it. After repeated attempts, my brain doesn't seem to be able to comprehend the commands.

These are the error messages as I have defined them:

ERR27 ASC "I/O ERROR",00
ERR28 ASC "DEVICE NOT CONNECTED",00
ERR2E ASC "DISK SWITCHED: FILE STILL OPEN ON OTHER DISK",00
ERR45 ASC "VOLUME DIRECTORY NOT FOUND",00
ERR52 ASC "NOT A PRODOS DISK",00
ERR55 ASC "VOLUME CONTROL BLOCK FULL",00
ERR56 ASC "BAD BUFFER ADDRESS",00
ERR57 ASC "DUPLICATE VOLUME",00

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Referencing ProDOS Error Messages in Memory Bill Chatfield <billchatfield1@gmail.com> - 2018-10-15 10:22 -0700
  Re: Referencing ProDOS Error Messages in Memory Marco Verpelli <mverpelli@libero.it> - 2018-10-15 11:09 -0700
    Re: Referencing ProDOS Error Messages in Memory Bill Chatfield <billchatfield1@gmail.com> - 2018-10-15 11:59 -0700
  Referencing ProDOS Error Messages in Memory Michael Pohoreski <michael.pohoreski@gmail.com> - 2018-10-16 00:08 -0700
    Re: Referencing ProDOS Error Messages in Memory Bill Chatfield <billchatfield1@gmail.com> - 2018-10-16 08:34 -0700

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