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Purpose: This paper seeks to clarify the research trend of library and information science (US) in Japan from 1970 to 2009. Methods: Of all the articles published from 1970 to 2009 in Library and Information Science and Journal of Japan Society of Library and Information Science, 826 research articles were examined. For each article, (1) authors, (2) topics, (3) research methods, and (4) the use of theories were analyzed. For (1), the number of authors of each article and the first author's affiliation and occupation were examined. Topics were classified into 14 US topics and these topics were further classified into "library science" and "information science". Empirical research methods were further divided into "data collection method" and "data analysis method". The number of research articles and the transition of the number of pages were also investigated. Results: Our findings indicate that in the US field over the last 40 years in Japan, (1) the number of authors whose affiliation is "university" has increased, (2) the number of "information science" articles has gradually decreased, and the majority of articles are now about "library science", and (3) the proportion of empirical research methods has increased. There were no major changes or distinctive trends in the topics discussed by articles. Due to the adoption of a strict peer-review system in both journals, the number of research articles decreased from the 1990s to 2000s; however, the number of articles has increased in recent years due to the increase in the number of graduate students and the enhancement of research grants in the US field. [ABSTRACT FROM AUTHOR]