@BOOK{NAP11657, author = "National Research Council", title = "CLEANER and NSF's Environmental Observatories", isbn = "978-0-309-10229-2", doi = "10.17226/11657", url = "https://nap.nationalacademies.org/catalog/11657/cleaner-and-nsfs-environmental-observatories", year = 2006, publisher = "The National Academies Press", address = "Washington, DC" }