@BOOK{NAP12431, title = "Recommendations of the Space Science Board for Space Experiments: Letter Report", doi = "10.17226/12431", url = "https://nap.nationalacademies.org/catalog/12431/recommendations-of-the-space-science-board-for-space-experiments-letter", year = 1958, publisher = "The National Academies Press", address = "Washington, DC" }