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Directory Results for Diatom 25: 134147 Taisuke Ohtsuka, Susumu Kato, Kazumi Asai and Toshiharu Watanabe: Checklist and illustrations of diatoms in Laguna de Bay, Philippines, with reference to water quality Abstract A taxonomic survey of the diatom flora of - - to Diatom 25: 148152 Kazuya Yoshizawa: Numerical estimation of the organic pollution of Arakawa River in Kofu city based on the attached diatom assemblage Abstract The organic pollution of Arakawa River in Kofu city was assessed using the - -