OECD (2021), "48 Paper and paperboard; articles of paper pulp, of paper or of paperboard: Poland: Harmonised System 2012",
in
International Trade by Commodity Statistics Volume 2020 Issue 5: Estonia, Israel, Latvia, Lithuania, Netherlands, Norway, Poland,
OECD Publishing, Paris,
https://doi.org/10.1787/86edd38e-en.
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