Verner W. Clapp (1901–1972) was named Chief Assistant Librarian at the U.S. Library of Congress and later served as the first president of the Council on Library Resources. He is well known for his efforts to establish the Congressional Research Service as well as to develop the concept of the machine-readable unit records, a forerunner of the MARC concept. And, as chairman of the U.S. Library Mission to Japan, he also made a significant contribution to the founding of the National Diet Library (NDL), which is why the NDL owns a collection of his books and papers.
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