https://northwoodslandtrust.org/the-story-of-old-growth-eastern-hemlock-at-beaver-creek-hemlocks-conservation-area/
https://www.arborday.org/programs/nationaltree/spruce.cfm#:~:text=The%20Spruce's%20Place%20in%20History,was%20flavored%20with%20budding%20leaves.
https://floridalumber.com/blog/post/construction-and-usage-of-spruce-lumber#:~:text=Red%20spruce%20wood%3A%20Locally%2Dsourced,crates%20and%20making%20round%20timber.
https://www.dnr.state.mn.us/trees/ironwood.html#:~:text=Very%20strong%2C%20hard%2C%20heavy%2C,Attractive%20ornamental%20tree.
http://npshistory.com/publications/apis/early-ag.pdf
https://discoverycenter.net/wp-content/uploads/2016/09/Hemlocks-ToHides7.pdf
https://www.realcedar.com/why-western-red-cedar/history/#:~:text=The%20Long%20History%20of%20Cedar&text=Western%20Red%20Cedar%2C%20a%20wood,the%20%E2%80%9CTree%20of%20Life.%E2%80%9D&text=Along%20B.C.'s%20Pacific%20Coast,baskets%20for%20thousands%20of%20years.
https://www.stikwood.com/blogs/workbench/discover-the-benefits-and-uses-of-cedar-wood
https://erc.cals.wisc.edu/woodlandinfo/files/2017/09/FR-053.pdf
https://witreeguy.com/colorado-blue-spruce/#:~:text=Seedlings%20generally%20grow%20to%20about,of%20twenty%20to%20thirty%20feet.
https://ruffedgrousesociety.org/know-your-cover-ironwood/#:~:text=The%20flowers%20on%20ironwood%20are,in%20the%20upper%20Great%20Lakes.