Free: Contests & Raffles.
I'd think there should be enough space on a CD for both. 1-28 are short clips, 29-57 are with the 15 second pause and repeated sound. Different people learn at different levels and in different ways, and it should be feasible to double your absorption rate on the same CD with a little editing magic. Teaching in sound bytes is hard to pull off, so you probably want to cover the spectrum both ways. If, however, you are narrating each sound and how it fits into elk hunting, then the 15 second pause method would be sufficient after the narration and sample sound.