A lot of schools have their fall rosters online. Here are a couple current examples, just as an illustration:
www.arkansasrazorbacks.com/sport/m-basebl/roster/ (41 on the roster)
http://usctrojans.com/roster.aspx?path=baseball (42 on the roster)
No more than 35 allowed on the Spring roster. First thing you might want to do is research that school and see what its fall roster looks like.