Determination of angiosperm families by means of a punched-card system.
By: By Bertel Hansen and Knud Rahn.
Contributors: Rahn, Knud, joint author.
Series: Dansk botanisk arkiv,; bd. 26, nr. 1
Publisher: Dansk Botanisk Forening
Published: 1969
Place of publication: København
Language: eng
Number of pages: 45
Subjects: Angiosperms -- Identification.; Punched card systems -- Botany.
Notes: Issued in case, with 172 punched cards.