The Chemed-l discussion group has moved. The new address for signing up and accessing the group is:
http://groups.google.com/group/chemed-l. (Effective May 30, 2011.)
Note that the final character of the group name is a lower case letter "el" (not the number "one"). (It may or may not matter whether it is capitalized.)
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Last update: March 24, 2013