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Dyfyniad Arddull ChicagoRoth, G.D. The System of Minor Planets. Princeton, New Jersey: Van Nostrand, 1962.
Dyfyniad MLARoth, G.D. The System of Minor Planets. Van Nostrand, 1962.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.