Len Cram A Journey with Colour 2B signiert

• vol. 1. A history of Queensland opal, 1869-1979.
• vol. 2, pt. A. A history of White Cliffs opal, 1889-1999.
• vol. 2, pt. B. A history of Lightning Ridge opal 1873-2003.
• vol. 3. A history of South Australian opal 1840-2005.

Includes bibliographical references and indexes.

History of Queensland opal 1869-1979

History of White Cliffs opal 1889-1999

History of Lightning Ridge opal 1873-2003

History of South Australian opal 1840-2005