Below the surface there's Technokolla

Marson, Erica | Online Contents | 2008

On, and Below, the Surface

Weisenberger, G. | British Library Online Contents | 2010

Looking below the surface. Structural monitoring

Inaudi, D. / Laloui, L. / Steinmann, G. | British Library Online Contents | 2000

Tunnel taps mystic lake below water surface

Engineering Index Backfile | 1926

Climate Change Stored Below the Earth's Surface

Cermak, V. / Safanda, J. / Bodri, L. | British Library Conference Proceedings | 1997