But, it's the [link|http://www.hbcpnetbase.com/hbcp/|same beast.] I bought mine in the 1950's (39th edition), loaned it to my engineer daughter when she was in college in the 1980's and it's still on her bookshelf. I do not miss it.

The density or melting point of lead has not changed since those days. All is on-line, e.g. [link|http://www.webelements.com/webelements/elements/text/Pb/heat.html|Lead.]