Utensilios de dibujo técnico (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Utensilios de dibujo técnico" in Spanish language version.

refsWebsite
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benzilla.com

britannica.com

google.ca

books.google.ca

  • [1] John Fry Heather Mathematical instruments: their construction, adjustment, testing, and use, comprising drawing, measuring, optical, surveying, and astronomical instruments (Crosby, Lockwood and co., 1884) pages 1-2

mathsinstruments.me.uk

theaecassociates.com