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WW1 - Royal Air Force - Pilots and Observers mark targetsWW1 - Royal Air Force - Pilots and Observers mark enemy german targets and positions. Date: circa 1918
Aerial photography in World War OneA illustrated explanation of the uses of and how aerial photography worked in World War One. Aerial photography was introduced as an additional means of observation
Leif Havik on site at Vaarhus Kjoelen, NorwayHessdalen Project member Leif Havik tests observational equipment at Vaarhus Kjoelen, Norway. Mysterious lights appear regularly over Hessdalen, Norway, and have never been explained
Peking ObservatoryCross-section of the observatory, showing globes, quadrants and other observational equipment
