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The part of a sentence "copies of which" is correct and usable in written English.
You can use it when referring to something previously mentioned in a sentence to indicate that whatever is being referred to is the same thing that the previous sentence was talking about. For example: The book was very popular, copies of which were sold out quickly.
Exact(56)
He described the process in his book Jungle Fever, copies of which now go for hundreds of pounds.
Also useful are local newspapers, such as the Jamaica Gleaner, archived copies of which are online at gleaner.newspaperarchive.com.com
Afterward, Zuckerman sent Gluckman several lengthy letters of apology, carbon copies of which were exhumed from Zuckerman's attic.
The FT's UK and Ireland edition sold a total of 109,745 copies, of which 30,576 were bulks.
Wasid showed the Guardian his military ID and application for refugee status, copies of which have been kept.
The book, 1,000 copies of which arrived on the campus today from the printer in Chicago, is sometimes serious.
He called the edition, 1,480 copies of which are being published, "adventurous and respectful of the author's expressed wishes".
So the letter, copies of which were sent both to him and his wife, made him angry.
She helped Har Dayal launch his revolutionary paper Bande Mataram, copies of which were smuggled into India from London.
The General Accounting Office issued the findings in two reports on the Pentagon's lack of control over airline travel, copies of which The Associated Press obtained.
It finally appeared on 8 November 1900 in an edition of 1,008 copies, of which 129 were sent out for review and 465 were actually sold.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com