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Hansen, B. & K. Rahn. 1969. Determination of angiosperm families by means of a punched card system. Dansk Botanisk Arkiv 26.
Families of Angiosperms: Punched Cards by Hansen & Rahn
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Families of Angiosperms by Bertel Hansen & Knud Rahn
Hansen, B. & K. Rahn. 1969. Determination of angiosperm families by means of a punched card system. Dansk Botanisk Arkiv 26. Families of Angiosperms: Punched Cards by Hansen & Rahn |
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