Lots of nice people have pointed out typos and recommended improvements. They include:
Bonita Dueck, MLIS, University of Calgary
Erik Geiger
Kathryn Roosa, faculty, Austin Community College (Austin, Texas)
Ervin Gonzalez
Robert Rodriguez
Ianthe Sarrazin
James Ball
Kim Bravo
Rob Napier
GlobalSpec — Science & Lab Equipment
GlobalSpec — General Engineering
and many more . . .
