Weller's "Better Soldering" booklet:http://www.cooperhandtools.com/brands/electronic_applications/55578.pdf
Weller's "Tip Care and Use"
http://www.cooperhandtools.com/brands/electronic_applications/Weller/instructions/Tip%20Care%20and%20Use.pdf
Weller's "Ten Commandments of Soldering"
http://www.cooperhandtools.com/brands/electronic_applications/ten_comm.htm