Anatomical changes of Pea(Pisum sativum L.cv Massey Gem) and wheat (Triticumaestivum L.var Machetti) leaves exposed to Uv-B radiation = Perubahan struktur anatomi daun kacang ercis .. - Perpustakaan UGM, i-lib ([Yogyakarta] : Universitas Gadjah Mada, 1995)