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*arrioja, adolfo vizcaíno "el sueco que se fue con pancho villa" (editorial océano de méxico, 2000) isbn 970-651-402-3*turner, timothy g. "bullets, bottles and gardenias" (southwest press 1937)*tunis, edwin "weapons: a pictorial history" p61 (the johns hopkins university press 1999) isbn 978-0-8018-6229-8== external links ==*gray court, estate of major general ivor thord-gray at belle haven in greenwich, connecticut
* arrioja, adolfo vizcaíno "el sueco que se fue con pancho villa" (editorial océano de méxico, 2000) isbn 970-651-402-3* turner, timothy g. "bullets, bottles and gardenias" (southwest press 1937)* tunis, edwin "weapons: a pictorial history" p61 (the johns hopkins university press 1999) isbn 978-0-8018-6229-8* gray court, estate of major general ivor thord-gray at belle haven in greenwich, connecticut