Here's what other sites are saying:
The Garmin MapSource Topo microSD card lets you add richly detailed topographic maps of California and Nevada to your Garmin GPS receiver.
Garmin's new TOPO U.S. 24K gives you the highest level of topographic detail available. They have taken 24K topo data for the U.S. and have made regionalized coverage available on DVD or preprogrammed microSD cards with SD adapter. These new TOPO U.S. 24K regions will help ensure you're ready for your next backpacking, hiking or camping adventure.
- Altrec Outdoors
Garmin Topo US West 24K DVD
Garmin TOPO Alaska Enhanced microSD Data Card
Lowrance Endura Topo Map microSD - West Coast
National Geographic Weekend Explorer 3D - Northern California CD-ROM
National Geographic Trails Illustrated: Sierra Nevada SD Card
Garmin Trailhead Series Pacific Crest Trail SD Card
National Geographic TOPO! Washington CD-ROM
National Geographic TOPO! Alaska CD-ROM