Over the last ten years the above Working Party has collected and distributed seed of a number of tree species from north-west America. At the IUFRO Congress in Oslo in 1976 it was decided that the activity of the Working Party should terminate. Some seed is still in stock, and is offered for sale (cash or exchange basis). The prices (excepting freight charges) are as follows:
| Abies grandis | $US | 70 | per kg |
| Picea sitchensis | $US | 160 | per kg |
| Picea engelmannii | $US | 80 | per kg |
| Picea mariana | $US | 10 | per kg |
| Picea pungens | $US | 80 | per kg |
| Pinus contorta | $US | 160 | per kg |
| Pseudotsuga menziesii | $US | 150 | per kg |
A list of provenances can be obtained from the FAO/Danish Forest Tree Seed Centre, DK-3050, Humlebaek, Denmark.
