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Please read BHL's Acknowledgment of Harmful Content
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  1. By: International Botanical Congress (5.º 1930. Cambridge, Reino Unido)
    Publication info: London : Printed under the autority of His Majesty's Stationery Office, by Wyman & sons, Ltd., Fetter Lane, London [...], 1929
    Holding Institution: Biblioteca Digital del Real Jardin Botanico de Madrid