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Peter Henderson & Co's tested seeds - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Peter Henderson & Co, 1891)

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Peter Henderson & Co.s manual of everything for the garden : 1890 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Peter Henderson & Co, 1890)

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Petro nomine ac imperio primo Brasiliensis imperii perpetuo defensore ... jubente Florae fluminensis icones, nunc primo eduntur ... - Velloso, José Mariano da Conceição, 1742 -1811 (Ex off. lithogr. Senefelder, curante J. Knecht, 1827)

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Die Pflanzenwelt Ost-Afrikas und der Nachbargebiete - Engler, Adolf, 1844 -1930 (D. Reimer, 1895)

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