Historical Magnetic Declination
https://maps.ngdc.noaa.gov/viewers/historical_declination/
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How to store stuff outside your pack
This page has some good advice on and descriptions of ways to attach gear on the outside of your backpack. Sectionhiker.com
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History of Backpacking Gear
The “History of Gear Project” site is remarkable! This guy has, crudely in some respects, patched together an interesting series of pages and links on the historical roots of most backcountry gear and gear companies today. A lot of this information is not easily found even with today’s wide-reaching search algorithms. From the origins of…
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ZPacks gear
ZPacks accessories sell some pretty nifty lightweight gear for hiking and backpacking.