Introduction to electronic computers; problem solving with the IBM 1620 Fred J. Gruenberger and Daniel D. McCracken. Gruenberger, Fred, 1918-1998. McCracken, Daniel D., joint author. IBM 1620 (Computer) QA76.8.I16 G7 510.81 GRI "Each chapter was published by the Rand Corporation as an independent paper." Bibliography: p. 62-63. New York : Wiley, c1963 c1963 1963 Text vii, 170 p. : eng A Rand Corporation research study