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@Article{Gapen:1919:TPP, author = "C. E. Gapen", title = "Taking the Plod Out of Plowing, The Natural Triangulation Station, and more", journal = j-SCI-AMER, volume = "121", number = "1", pages = "13--15", day = "5", month = jul, year = "1919", CODEN = "SCAMAC", DOI = "https://doi.org/10.1038/scientificamerican07051919-13", ISSN = "0036-8733 (print), 1946-7087 (electronic)", ISSN-L = "0036-8733", bibdate = "Sat May 18 16:27:14 MDT 2013", bibsource = "http://www.math.utah.edu/pub/tex/bib/sciam1910.bib", URL = "http://www.nature.com/scientificamerican/journal/v121/n1/pdf/scientificamerican07051919-13.pdf", acknowledgement = ack-nhfb, fjournal = "Scientific American", journal-URL = "http://www.nature.com/scientificamerican", }