bookkeeping clerks are employed in every industry; the individual industries employing the largest numbers of clerks are local government and the accounting, tax preparation, bookkeeping, and payroll services industry.
The views expressed in this post are my own personal (HRA protected) views, and are not representative of any organisation I have any involvement with.
I must agree with Kris and I am also trying to work out what you are saying.
All of the bookkeepers on this forum I believe are UK based and having looked at the link in your post it takes me to a site for a company in USA, so if you don't mind me asking, what are you doing posting on here.