We use acmemapper to create our own --to exactly the scale we want. We love them.

And then we take a large map like Nat Geo or Time Harrison so we can identify the peaks on the horizon...or take a new direction that we didn't initially plan.
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Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963