543 Bel N Belcher , Ronald New methods in analytical chemistry [by] Ronald Belcher and Cecil L. Wilson .London ] Champan and Hall [ 1956] 304 p. ilus . 22 cm Incluye bibligrafia <a id= "rdfa" about="http://bnjm.sld.cu/cgi-bin/item.py?idficha=bcuhcgrlyfof0100292" property = "oa:link" href="http://www.worldcat.org/oclc/1081632554">WorldCat</a>