The executive summary begins:

What have you found useful in executing your work or in navigating your career? What is dog-eared? What do you still pull off the shelf? What do you quote? What books did you find influential and kept from college or grad school that you feel contributed to your practice? Contributors were asked to include a sentence or two about why they recommended a particular title.

The resultant list is divided by topics and with brief statement about why the work is treasured.

You need to register (free) to download the entire report.  I suspect any trainer or educator will find something of interest on this list. The list might be especially valuable to someone who is new to the field.  Of course, I expect some will disagree with this list and I hope those people will create and publish a list of their own.