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Dyfyniad Arddull ChicagoCherkasov, I I. Lunar Soil Science: Physico- Mechanical Properties of Lunar Soils. Jerusalem: Keter, 1975.
Dyfyniad MLACherkasov, I I. Lunar Soil Science: Physico- Mechanical Properties of Lunar Soils. Keter, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.