Developments in Forest and Environmental Law Influencing Natural Resource Management and Forestry Practices in the United States of America and Canada : selected Contributions submitted to the IUFRO Research Group 6.13.00 Forest Law and Environmental Legislation. Eds. Franz Schmithüsen, William C. Siegel. Vienna : IUFRO, 1997. vi, 373 s. IUFRO World Series, Vol. 7. ISBN 3-901347-08-9. ISSN 1016-3263.