Excerpt from Proceedings of the Thirty-Eighth Annual Meeting of the Conference of State and Provincial Health Authorities of North America, Held at Washington, D. C., May 14, 15, 1923
Proceedings of the Thirty-Eighth Annual Meeting of the Это и многое другое вы найдете в книге Proceedings of the Thirty-Eighth Annual Meeting of the Conference of State and Provincial Health Authorities of North America, Held at Washington, D. C., May 14, 15, 1923 (Classic Reprint)