I am trying to get an idea what role the commercially available lab manuals play in driving undergraduate instruction.  I've been poking around on different databases, but I can't find any literature on this.  Some of the information I'm looking for involves: What % of institutions rely on these manuals for their introductory geology course laboratory instruction, and are there any studies regarding the efficacy of these manuals? Does anyone know of any papers that would be helpful? 

  I'm planning on calling publishers and asking them for some statistics (who knows if they are believable or not), but I was hoping there might be some scholarly work on this topic.

  I appreciate any insight that you would have on this...  I'm kind of new to the geoscience education realm.  

   Thank you for any help you can offer,
     Maggie Benoit

Margaret H. Benoit
Assistant Professor of Physics
The College of New Jersey
Science Complex P-113
Ewing, NJ 08628