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https://buy.garmin.com/en-US/digital/maps/on-the-trail-maps/topo-100k/topo-us-100k/prod127633.html It covers the entire United States. I have a copy of it and before I go out backpacking I load the appropriate sections into my Garmin device.
I have used the free caltopo.com for my recent trips. They use 7.5 minute quadrangles and stitch them together seemlessly. It is possible to create custom maps by creating tracks or import tracks created with Google Earth. They also have a topographical image overlay for Google Earth, which I have used extensively.
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