Hello. I'm planning to do the hike from Crested Butte to Aspen later this summer.  I'm trying to figure out what topographical maps to get. It's hard to determine that online without going into the store and reviewing them in person to find the correct maps.  Can anyone tell me which one(s) to purchase?  Also, any other info about that trail would be helpful. I'll be leading 7 adults and want to prepare properly.

Thank you. Matt