Yr Athro Deri Tomos a Bryn Tomos yn edrych ar wyddoniaeth pontydd. Professor Deri Tomos and Bryn Tomos look at the relationship between science and bridges. Show more
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Yr Athro Deri Tomos a Bryn Tomos yn edrych ar wyddoniaeth pontydd. Professor Deri Tomos and Bryn Tomos look at the relationship between science and bridges. Show more