HeadingSpon, Edward de used in: Bibliothèque nationale de France, Paris
Sources
Found inDictionary of engineering, civil, mechanical, military and naval, with technical terms in French, German, Italian and Spanish / Spons' [(Edward and Francis N.)] Supplement to Spons' Dictionary... edited by Ernest Spon,. - London : E. and F. N. Spon, 1873-1881. — http://gw.geneanet.org/pierfit?lang=fr&p=edward&n=de+spon (2017-01-11)