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some of these subterranean treasures are open to the public and have been specially adapted to receive visitors.
alguns desses tesouros subterrâneos estão abertos ao público e preparados para receber visitas de turismo.
this heading covers research into, and development of, techniques for the location and assessment of subterranean deposits.
esta divisão compreende a investigação e o desenvolvimento de técnicas de identificação e avaliação de jazigos do subsolo terrestre.