http://www.repairfaq.org/sam/ (http://www.repairfaq.org/sam/)
http://www.repairfaq.org/sam/sambook.htm (http://www.repairfaq.org/sam/sambook.htm)
http://members.misty.com/don/sulfbulb.html (http://members.misty.com/don/sulfbulb.html)
Post 420877 (https://www.thevespiary.org/talk/index.php?topic=6118.msg42087700#msg42087700)
(lugh: "Vacuum Pumps", Chemicals & Equipment) is from the same source ;D