331.823 Bla I Blake, Roland Patton. Industrial safety. 3d. ed. Englewood Cliffs, N. J., Prentice-Hall [c1963] 405 p. ilus. 24 cm "Bibliography" p. 396-398<a id= "rdfa" about="http://bnjm.sld.cu/cgi-bin/item.py?idficha=bcuhcgrlyfof0120065" property = "oa:link" href="http://www.worldcat.org/oclc/490795073 ">WorldCat</a>