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The Air Observation Posts were light aircraft flown by Royal Artillery pilots for the observation of fire
De nationale Rytterregimenters Officerspallasker
Ludvig XIV och Versailles
Jegstrup og J
Kriegswende an d
The German Sailor in World War Two Antropologi The Air Observation Posts wereBy J. P. Chantrain, R. Pied and R. Smeets