Voynichese's letters

[ReneZ]

post by ReneZ about his mod2 cipher system but the links in that post are dead.
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I revived the linked files as follows:
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The first is an approx. 10,000 words section of Pliny's natural history.
In the second file, each word has been replaced by a roman numeral according to a rule explained below.
Since the text has more than 3999 word types, I added (invented) the Roman numeral Q to represent 5000.
The third file introduces an alternative representation of the numbers (not Voynich-like).

The rule for substituting words by numbers (or codes) was as follows:

Make a list of plain text words and corresponding code words. In this case, the code word is the Roman numeral for the index of the word.

Now start off with a list of common words. I used the 400 most common words, sorted alphabetically. 
These are translated I to CD.
Then, as translation progresses, whenever a 'new word' not yet on the list appears, assign this word the next free number.

This results in a situation where similar words appear near each other.

This feature is demonstrated by graphs created by @nablator in the original thread.