Adjudicator: Duncan Brown
The use of various tables, diagrams and pictures is encouraged. Please note that the work of other authors should be acknowledged where appropriate. Publication of the work approved by the adjudicator may be published in the 'Naturiaethwr'.
Prize: £200 (Er cof am wir wyddonydd, Norman Colbourne, Rhosllannerchrugog)
Closing date: 1 April 2025 at 12 noon