Pam y cafodd Chwarel Dinorwig ei chau yn 1969? Cadi Iolen sy'n dyfalu. Cadi Iolen looks at the conspiracy theories behind the closure of Dinorwig Quarry in 1969. Show more
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Pam y cafodd Chwarel Dinorwig ei chau yn 1969? Cadi Iolen sy'n dyfalu. Cadi Iolen looks at the conspiracy theories behind the closure of Dinorwig Quarry in 1969. Show more