The Metgloss (Wendy Krieger)

This is a series of webpages, which are more about ideas behind a measurement system, rather than individual units etc.

It is essentially the working notes on metrology since 1983, along with tables of values. Multiple bases are discussed.

http://www.os2fan2.com/mgloss/index.html The metgloss
http://www.os2fan2.com/mglossn/index.html as nature intended (same file, but with þ for th).