Each zip file contains several mp3's of the same passage at different speeds.
151 Wolf in Sheep's Clothing
152 Farmer and the Stork
153 Swallow's Advice
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:
Labels: audiofiles, dictation, dictationpractice, gsf2dictation, simplified