How much survives and how much is lost to history?

[pfeaster]

or dismembered to be part of the capitalist biblioclasm of the twentieth-century.

I wish that had been limited to the twentieth century.  Dismemberment of "ordinary" Books of Hours and the like is distressing enough, but manuscripts with unique textual content are still routinely being split up for profit, such as notarial repertoires that contain the copies of record of all the land transactions, marriage agreements, wills, and so forth handled by a particular notary in a particular community over some months or years.  I could name sellers on eBay who routinely buy intact codices of this kind, dating back as far as the fifteenth century, and then auction them off leaf by leaf as novelties, with no apparent shortage of buyers.  I also know from their vague or incorrect descriptions that they can't read or identify the documents they're breaking up in this way, so that in theory these could be almost anything.  Even a key to Voynichese!