The hardness of the Irish chalk.

Míreanna comhchosúla

• Littorina perforations in indurated chalk. With plate.
  de réir: Welch, R. J.
  Foilsithe / Cruthaithe: (1929)
• The passing of the chalk.
  de réir: Cole, Grenville A. J.
  Foilsithe / Cruthaithe: (1921)
• Diatomaceae occurring in chalk.
  de réir: O'Meara, Eugene Rev
  Foilsithe / Cruthaithe: (1857)
• Foeailiferous fimsures in the chalk of North-East Ireland.
  de réir: Savage, R. J. G.
  Foilsithe / Cruthaithe: (1957)
• On analysis of white chalk from the County of Tyrone, with notes on the occurrence of zinc therein.
  de réir: Hardman, Edward T.
  Foilsithe / Cruthaithe: (1873)