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Are you Bertel Hansen, author of the books below?
Asphalt Renaissance by Bertel Hansen Balanophoraceae by Bertel Hansen Flora of Tropical East Africa - Balanophoraceae by Bertel Hansen Institutions, Entrepreneurs, and American Economic History by Bertel Hansen The genus Balanophora J. R. & G. Forster; by Bertel Hansen A catalogue of the herbarium specimens from Captain Cook's fi... by Bertel Hansen Determination of angiosperm families by means of a punched-ca... by Bertel Hansen Flora of tropical East Africa by Bertel Hansen


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