Mike and Adam,
As someone who meanders in a discipline that thought we had the trademark on the word slides (i.e. visual resources, aka art history slideroom folks), I might suggest:
1 presentation (53 slides) : col., digital, HTML file
That way, if you want, you can put PowerPoint in a note as desirable, and you get your unitary term in 300$a.
Sherman Clarke - NYU Libraries - [log in to unmask]