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4. *Batten, Sir W. (1630). A most plaine and easie way for the finding of the sunnes amplitude and azimuth, and thereby the variation of the compasse, by logarithme. N.p.: E. Allde for J. Tapp.
5. Borgman, C. L. (2007). Scholarship in the digital age: Information, infrastructure, and the Internet. Cambridge, MA: MIT Press.