Van Nao, T. (1982). Forest fire prevention and control: Proceedings of an international seminar organized by the Timber Committee of the United Nations Economic Commission for Europe, held at Warsaw, Poland, at the invitation of the government of Poland, 20 to 22 May 1981. The Hague: Martinus Nijhoff Publishers.

Van Nao, T. Forest Fire Prevention and Control: Proceedings of an International Seminar Organized By the Timber Committee of the United Nations Economic Commission for Europe, Held At Warsaw, Poland, At the Invitation of the Government of Poland, 20 to 22 May 1981. The Hague: Martinus Nijhoff Publishers, 1982.

Van Nao, T. Forest Fire Prevention and Control: Proceedings of an International Seminar Organized By the Timber Committee of the United Nations Economic Commission for Europe, Held At Warsaw, Poland, At the Invitation of the Government of Poland, 20 to 22 May 1981. The Hague: Martinus Nijhoff Publishers, 1982.