Poster with library network growth graph

Photograph of a poster with a graph showing the growth of the network of library institutions. The poster has four columns with captions: 12,600 (1914), 39,900 (1958), 450,000 (1965), and without numbers (1970). The poster's headline in large font: "GROWTH OF THE NETWORK OF LIBRARY INSTITUTIONS." The poster is placed on a dark background.