early Aviation Airplanes 1918-20 Magazine covers lot x 10 great imagesScientific American Aviation Prints. (Aviation lighter than air dirigibles balloons airplanes) Issued US, 1918 1920 for Scientific American magazine, a publisher of great artistic covers. By modern standards, each image is historically interesting and well worthy of display. Lot of ten (10). Minor light toning as typical for sheets of paper of this vintage, perhaps small minor edge flaws, old writing, stamps, etc. but to our eyes and for most people,