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Araucarioxylon cubic feet per day epeirogenic geology ever-mountings fine-grained ingot get the final word Huatuo's Zhongzang classic kanner law of refraction (snell's law) lead melting kettle multiplier-accelerator Mycenaean civilisation nerita striata PW (present worth) quick acting reverse-current circuit breaker relative economic status shalala stable fission product poisoning strikes off xylophonically