Alpine plants : a practical method for growing the rarer and more difficult alpine flowers - Clark, W. A. (L.U. Gill, 1901)

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Cassell's popular gardening - Fish, D. T. (David Taylor), 1824 -1901 (Cassell, 1884)

The different forms of flowers on plants of the same species - Darwin, Charles, 1809 -1882 (J. Murray, 1884)

Ellwanger & Barry Mt Hope Nurseries 1916 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Ellwanger & Barry, 1916)

The gardener's magazine and register of rural & domestic improvement - Loudon, J. C. (John Claudius), 1783 -1843 (Longman, Rees, Orme, Brown and Green, 1834)

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Icones florae Germanicae et Helveticae, simul Pedemontanae, Tirolensis, Istriacae, Dalmaticae, Austriacae, Hungaricae, Transylvanicae, Moravicae, Borussicae, Holsaticae, Belgicae, Hollandicae, ergo Mediae Europae. Iconographia et supplementum ad opera Willdenowii [et al.] ... - Reichenbach, H. G. (Heinrich Gustav) 1824 -1889 (F. Hofmeister [etc.], 1844)

Natuurkundig tijdschrift voor Nederlandsch Indië - Koninklijke Natuurkundige Vereeniging in Nederlandsch Indië. (Lange, 1873)

Novus conspectus florae Europae; sive, Enumeratio systematica plantarum omnium in Europa hucusque sponte cognitarum - Gandoger, Michel, 1850 -1926 (A. Hermann, 1910)

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Zwei pflanzengeographische Documente - Drège, Jean François, 1794 -1881 (1843)