the article is mostly about the pound in general with no mass force distinction due its historical treatment as a weight perhaps the numerous incarnations of the pound should be in a generic pound article and pound mass should be in a similar category to any other unit of mass in a specific system in this case the pound mass is a member of the fps gravitational system of units there should be a link to the pound mass article from the pound article of course but it deserves no better treatment than the lb of the fps engineering system there is a table of the fps systems at pound force and at slug mass which tabulates various fps systems it's a little less clear than it used to be what was simply called fps engineering is now engineering absolute and the fps gravitational system of units is apparently clambering for some credibility by calling itself the engineering gravitational system which of course has no use in engineering due to its offence to newton's nd law where did the gravitational system come from maybe some reliable sources are in order