Convert kg/m to pound/liner foot (PLF)

Convert kg/m to pound/liner foot (PLF)   (08/21/2012, 1:47 PM)

I need to know 1 kg/m = PLF
on this website 1 kg m = 7.23301385 lb ft
on other website 1 kg/m = 0.671968975 pound/foot
what is the dissimilarity between the two? the reason I am asking is working on project and all drawings Kg/m and I have to convert them
anyone please can help
thanks,