@BOOK{NAP18425, author = "National Research Council", title = "Biological Productivity of Renewable Resources Used as Industrial Materials", doi = "10.17226/18425", url = "https://nap.nationalacademies.org/catalog/18425/biological-productivity-of-renewable-resources-used-as-industrial-materials", year = 1976, publisher = "The National Academies Press", address = "Washington, DC" }