OECD (2021), "13 Lac; gums, resins and other vegetable saps and extracts: Portugal: Harmonised System 2012",
in
International Trade by Commodity Statistics Volume 2020 Issue 2: Finland, Greece, Iceland, Portugal, Sweden, United Kingdom,
OECD Publishing, Paris,
https://doi.org/10.1787/017cf041-en.
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