Reference Topics 8-1

The international system of weights and measures (Historical Document) can be found here:
https://www.govinfo.gov/content/pkg/GOVPUB-C13-7bce1f6babbcbb82fe740fbde6ff1738/pdf/GOVPUB-C13-7bce1f6babbcbb82fe740fbde6ff1738.pdf

The book Flatland (suggested as a book report at the end of the chapter) can be found online at:
http://www.alcyone.com/max/lit/flatland/

A very useful dictionary of units … See the whole entry