Artillery Training, Volume III, Field Gunnery, Pamphlet No. 7, Calibration, 1943 - Engeland Voorschrift 26/GS Publications/1454 Artillery Training Volume III, Field Gunnery, Pamphlet No. 7, Calibration, 1943 - Engeland Voorschrift 26/GS Publications/896 Artillery Training Volume VI, Survey Pamphlet No. 11, Estimation of Calibre from Time of Flight, 1944 - Engeland Voorschrift 26/GS Publications/1273
