Subsurface mapping.

Eitemau Tebyg

• An introduction to geological maps /
  gan: Thomas, J. A. G. (John Albert Gay)
  Cyhoeddwyd: (1977)
• Geological maps /
  gan: Simpson, Brian
  Cyhoeddwyd: (1968)
• Standards and specifications for the preparation of geological maps,
  gan: Debain, P.
  Cyhoeddwyd: (1972)
• Contributions to the history of geological mapping : proceedings of the Xth INHIGEO Symposium, 16-22 August 1982, Budapest, Hungary /
  Cyhoeddwyd: (1984)
• Geometrische Grundlagen der Geologie /
  gan: Gwinner, Manfred P.
  Cyhoeddwyd: (1965)