I 510.7834 Will D Williams, Samuel Byron, 1881- Digital computing systems. New York, McGraw-Hill, 1959. 229 p. ilus. 24 cm <a id= "rdfa" about="http://bnjm.sld.cu/cgi-bin/item.py?idficha=bcuhcgrlyfof1100412" property = "oa:link" href="http://www.worldcat.org/oclc/934076424 ">WorldCat</a>