Abstract
ABSTRACT For two American and three non-American astronomical journals, we counted the numbers of papers during 1949-89 representing the following authorships: purely national, mixed national and foreign, and purely foreign. In the four major journals (ApJ, AJ, MNRAS, and A&A) the foreign input was constant from 1949 until the early 1970s and it has increased steadily thereafter to reach a current level of about 30%. There has also been a large increase in the numbers of mixed national and foreign papers, showing that currently about one-quarter of all the published papers represent multinational collaborations.
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