Lee Krasner, Springs, New York by Irving Penn

1972 / Gelatin silver print / Paper: 9 15/16″x8 1/16″ / ©The Irving Penn Foundation
From the exhibition “PROOF: Photography in the Era of the Contact Sheet”

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CONTACT SHEET: After a roll of film was developed, the negatives were cut into strips and printed by contact. The 36 exposures of a roll of 35 mm film or the 12 exposures of 2¼ inch film fit comfortably on an 8 x 10 inch sheet of paper. With an 8 x 10 inch enlarger, the same array of negatives could produce a so-called enlarged contact, often measuring 16 x 20 or 20 x 24 inches.
~ https://www.clevelandart.org/exhibitions/proof-photography-era-contact-sheet-collection-mark-schwartz-and-bettina-katz