United States. Bureau of Labor Statistics and International Association of Public Employment Services. "Proceedings of the Ninth Annual Meeting of the International Association of Public Employment Services. Held at Buffalo, New York, September 7-9, 1921 : Bulletin of the United States Bureau of Labor Statistics, No. 311," Proceedings of the Annual Meeting of the International Association of Public Employment Services (August 1922). https://fraser.stlouisfed.org/title/4022/item/493032, accessed on December 21, 2024.