English Ellipse sign 32 blue shield applies to jurisdiction: United States of America determination method: work of the federal government of the United...
svg|Gnomonic triangle File:Bettini(1660)-(2).svg|Circle marked each 30° File:Bettini(1660)-(3).svg|Construction Lines File:Bettini(1660)-(4).svg|Hour...
content of the textbook is written in LaTeX, then converted to HTML-friendly SVG format using a collection of scripts called PreTeX: this was coded by Rabinoff...
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