Some of the reasons I have encountered for why there are no credit panels in
exhibitions to acknowledge who did what include:  1.  We couldn't list
everyone's name and we didn't want to leave anyone out so we didn't put
anything up.  2.  We didn't have room/time/money.  3.  It is the museum's
policy not to single out any one person for special recognition because
everyone, in some way, helped.  4.  Doesn't everybody know that the curator
was responsible for it all?
There are probably many others.
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