@BOOK{NAP21517, title = "Proceedings of the Office of Critical Tables Advisory Board Meeting", doi = "10.17226/21517", url = "https://nap.nationalacademies.org/catalog/21517/proceedings-of-the-office-of-critical-tables-advisory-board-meeting", year = 1969, publisher = "The National Academies Press", address = "Washington, DC" }