General notions of organization and tactical suggestions indispensable to the balloon observer - United States. War Department. Division of Military Aeronautics (Washington, Govt. Print. Off., 1918)
Supplemented by: Supplement to the pamphlet entitled General notions of organization ... indispensable to the balloon observer... Washington, Govt. print. off., 1918. 15 p. tables. 18 cm.
On title page of supplement: This Supplement is intended to supersede Part 1 of the pamphlet, which is erroneous in that it is not up to date.
Keywords: Balloons -- Tracking; Aeronautics, Military; Air warfare