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Daeareg: Dod o hyd i Lyfrau

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Nodau silff

333.7 Cyfoeth naturiol
338.2 Economeg echdynnu mwynau
344.20446 Cyfraith amgylcheddol
550 Gwyddorau daear
526.9 Tirfesur
551 Daeareg 
551.41 Geomorffoleg
551.5 Meteoroleg
551.6 Hinsawdd
551.9 Geocemeg
552 Petroleg
552.5 Gwaddodion
553 Economic geology
554-559 Regional geology
560 Palaeontology
621.3678 Daeareg economaidd
622 Mwyngloddio
631.64 Adfywiad
634.956 Ailstrwythuro
910.02 Daearyddiaeth Ffisegol

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