microfilm

Mexico's national archives had counted the document among a collection of papers signed by Cortés - but found 15 pages were missing when it was put on microfilm in 1993.

Traditional paint on canvas was often sidelined in favor of modern industrial materials such as poured resin, ground glass, lacquers and microfilm coatings.

On one occasion, she received a microfilm that showed German forces lining up along the Soviet border for what looked like an imminent attack.

Previous attempts at putting the magazine on microfilm had resulted in barely legible pages marred by heavy black smudging, with some parts of pages missing or damaged.

Its microfilm library contains scans of some homes’ original permits.