Send to LISTSERV@LISTSERV.LOYOLA.EDU the following command:

INDEX AECM


You should get back a list similar to the following:

* Archive files for the AECM list at LISTSERV.LOYOLA.EDU
* (weekly logs)
*                                       rec             last - change
* filename      filetype        GET PUT -fm lrecl nrecs date     time
* --------      --------        --- --- --- ----- ----- -------- --------
  AECM          LOG9710A        LOG OWN  V    608   575 98/04/07 18:49:40
  AECM          LOG9710B        LOG OWN  V    577   748 98/04/12 23:08:46
  AECM          LOG9710C        LOG OWN  V     80   402 98/04/21 09:54:07
  AECM          LOG9710D        LOG OWN  V     79   306 98/04/23 10:39:08

             [NOTE: The above data is a made-up example.]

Then, assuming you want the archives for the first week of April 1998,
send a command such as: 

GET AECM LOG9710A


You should get back something like the following plus all the text from 
all posts for the week:

From:   IN%"LISTSERV@LISTSERV.LOYOLA.EDU"  "L-Soft list server at LISTSERV.LOYOLA.EDU"
To:     IN%"RICE@LOYOLA.EDU"  "Barry Rice"
CC:     
Subj:   File: "AECM LOG9710A"

For more information about searching list archives via email commands, 
see the LISTSERV General User's Guide.