Vintage National Geographic June/July 18', July has Upside-down Bound page error

Vintage National Geographic magazines from June 1918 and July 1918, published during the World War I era. The July 1918 issue contains an unusual binding/manufacturing error in which approximately 16 pages are bound upside down. This appears to be an original production error rather than later damage. Both magazines show age-related wear consistent with over 100 years of age. Pages remain readable and contain period photography, illustrations, maps, and historical articles from the WWI period. An interesting pair for National Geographic collectors, World War I historians, vintage magazine collectors, or printing-error enthusiasts.