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Title Biologie der Pflanzen : Rosemarie Langenfeld-Heyser Author Raven Peter H. Co-authors Evert R.F. Another authors Curtis Helena Issue data Berlin : Walter de Gruyter , 1985. - 764 s. Copy count 1, currently available 1 Document kind monografie 
book
Title Phloem Structure in Pyrus communis and its Seasonal Changes Author Evert R.F. Issue data Los Angeles : Univ.of California Press , 1960. - 193s. Copy count 1, currently available 0, at library only 1 Document kind monografie book