Each zip file contains several mp3’s of the same passage at different speeds.
126 Miss Yale
127 Miss Dwyer
128 Annoying Weeds
129 Selling by Mail
130 Erie Railway
File names are in the format: gsf2-13-110-40-90.zip
gsf2 = Gregg Simplified Functional 2nd Edition
-13 = Lesson 13
-110 = passage 110
-40-90 = speeds from 40-90 wpm in 10wpm increments.
See this post for more info: