There are other codes on russian books:
УДК = Universal Decimal Classification (UDC), example: УДК 821.111(73)
ББК = Library bibliographic classification, example: ББК 84(7Сое)
Author's sign, example: Б48

Please, add it to the list!

Moreover UDC is international classifier. There is the non-profit UDC Consortium, which moderates it. This identifier is a must have here.
https://en.wikipedia.org/wiki/Universal_Decimal_Classification

ББК is a USSR analogue of UDC. Nowadays it's actively used in Russia, only recently discontinued in Ukraine. Not sure about the other post USSR countries. And still - this is a huge amount of books covered and thus a must have here.
https://fr.wikipedia.org/wiki/BBK_(classification)

Please don't ignore this.

+1 add this the support of these codes ASAP

Sorry for excessive message, the last bracket is a part of the link

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I also came here to wonder where these absolutley must-have fields for these codes are. ISBN was introduced in Russian only in 1987. How do we get to make accurate contributions without UDC’s and BBK’s?

HardBass wrote:

I also came here to wonder where these absolutley must-have fields for these codes are. ISBN was introduced in Russian only in 1987. How do we get to make accurate contributions without UDC’s and BBK’s?

ideally this "complex booktrading code" should be also added as it contains more info than UDC and BBK
https://ru.wikipedia.org/wiki/%D0%9A%D0%BE%D0%BC%D0%BF%D0%BB%D0%B5%D0%BA%D1%81%D0%BD%D1%8B%D0%B9_%D0%BA%D0%BD%D0%B8%D0%B3%D0%BE%D1%82%D0%BE%D1%80%D0%B3%D0%BE%D0%B2%D1%8B%D0%B9_%D0%B8%D0%BD%D0%B4%D0%B5%D0%BA%D1%81-%D1%88%D0%B8%D1%84%D1%80

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