Nitrogen-fixing phototrophs in the Ifugao rice terraces (Philippines) - Roger, Pierre A.; Voggesberger, Monica; Margraf, Josef (1986)
Includes bibliographical references.
Keywords: Nitrogen-fixing algae -- Philippines -- Ifugao; Cyanobacteria -- Philippines -- Ifugao; Azolla -- Philippines -- Ifugao; Terracing -- Philippines -- Ifugao