pamphlet Flash-Spotting training : Air Burst Ranging (for use by Survey Regiments, R.A.) war department technical manual Spotting sets PH-32-B, C, D and F, and spotting set AN/TVQ-1 Flash spotting, sound ranging and R.A. survey stores : section V 3 war department technical manual Spotting set PH-32-B Artillery training : Short base flash spotting / War Office. Vol VI: Survey / War Office
