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"Purpose and Scope - This manual is published for the information and guidance of the civilian Ground Observers in the Air Defense System. It provides a complete description of their duties and responsibilities. Contents - The first part of this manual explains the operation of the Air Defense System and specifies the reporting procedures to be followed by Ground Observers. The second part of this manual includes the illustrations and other data required for aircraft identification."--Page i.
Discusses communications methods, procedures, and other information between artillery and air units.