Yes, Beverly Serrell's book, "Exhibit Labels: An Interpretive Approach"
(Alta Mira Press, 1996; available through AAM and ASTC websites) is a must,
and contains numerous examples of good and bad labels.

Also, I maintain a website for my students at Michigan State University.

http://www.msu.edu/~dillenbu/

Scroll down to "Photos of Exhibits" and you'll find a collection of photos
organized along various themes.  Two of the themes are "Good Labels" and
"Bad Labels."  For the negative examples, I found it helpful for my
students, rather than simply critize, to explain how they could be improved.

Eugene Dillenburg
Exhibit Developer, Science Museum of Minnesota
Research Associate, Michigan State University
Grammar Police, Descriptivist Division
Cubs Fan, Long-Suffering

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