Hill, Fredrick J. . Digital System / Textual Documents Fredrick J. Hill & Gerald R. Peterson. - 3rd ed / - New York : John Wiley & Sons , C 1987. - xi, 601p. : ill. ; 23cm. . Index ISBN: 0-471-85936-2 Subjects--Index Terms: Computer- Digital System Dewey Class. No.: 001.64044 / Hi 55 Di