3 links
Phosphorus
hoptechno.com
Includes basic functions, food sources, suggested intake, and necessity in the diet.
Phosphorus
mmeade.com
Brief essay on the mineral with list of good food sources, suggested intake, and functions.
Phosphorus
lpi.oregonstate.edu
A discussion of phosphorus with functions, deficiency signs, food sources, supplements, and recommendations from the Linus Pauling Institute.