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Retno Hartati and M.Z. Nuri and A.Y.A. Yanto and Widianingsih and Edy Supriyo and Agoes Soegianto (2020) Organic matter, chlorophyll and grain size features of the sediment in the culture sea pens of holothuria atra (Holothuroidea, echinodermata). Annals of Biology, 36 (2). pp. 311-316. ISSN 0970-0153