Changes

* [http://scholar.google.com/scholar_url?url=http://www.academia.edu/download/55616927/Academia-The_Rise_and_Fall_of_Gruit.pdf&hl=en&sa=X&d=3163361726042789736&scisig=AAGBfm1GJ2cXL-kYOPzL49R8fvybrwlGDA&nossl=1&oi=scholaralrt&hist=CYJIrnMAAAAJ:10241589793194662084:AAGBfm17pAuQUDgk8QVeubsITC7flr3nZQ "The Rise and Fall of Gruit" by Susan Verberg.]

* [https://spruceontap.com SpruceOnTap.com (vendor for spruce tips, juniper, and other herbs).]

==References==