Query: weapons of mass destruction

To readers of this list:

I am interested in the origins of the phrase
"weapons of mass destruction." Does anyone
have any idea of its earliest usage, or
where I might look for info?

Thanks very much.
Nina

I'd also be interested to find out who coined this phrase. Doing a search in Altavista the earliest references I could find are:
1. 1977 - a paper entitled "Weapons of Mass Destruction and the Environment" by A.H. Westing.
2. A folder entitled "Weapons of Mass Destruction" being an archive of activities conducted by a peace movement group called SANE between 1968-1975. In this case the title may have came after the fact. (www.library.temple.edu/ urbana/urb50.htm)