peculiar results

Building a new site and trying to grab category specific RSS from:
http://gclibrary.commons.gc.cuny.edu/

Using:
http://gclibrary.commons.gc.cuny.edu/category/Slider/?feed=rss2

But not parsing, grabbing all posts and not just posts from:
http://gclibrary.commons.gc.cuny.edu/

But also:
http://library.gc.cuny.edu/

Also, once I have the parsing/selection issue resolved, can I display specific posts from another site as a slideshow?

http://wordpress.org/plugins/category-specific-rss-feed-menu/