'Paper for Conference of the International Union of Forest Research Organisations, Gainesville, Florida, 14-20 March, 1971. Section 22. Study of forest trees. Working Group on International Provenance Trials'.
Current position and plan for the international provenance trials with Pinus contorta by Roger Lines. ISBN 0855380373. Published by Forestry Commission in 1971. Publication and catalogue information, links to buy online and reader comments.