A drawing printed on page 155 of the 1905 book (the date means it is in public domain now) The Art of Organ-Building, Vol. I, by George Ashdown Audsley. Traced by potrace 1.12.
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Organ in the Church of Santa Maria della Scala, Siena free icon was designed by AdamStanislav for icons Png and presented to its users.
AdamStanislav
12/23/2017