The only perfect reference work Nelsons Perpetual Loose-Leaf Encyclopaedia

“The only perfect reference work” Nelson’s Perpetual Loose-Leaf Encyclopaedia
From Popular Mechanics from 1910 comes this advertisement for Nelson’s Perpetual Loose-Leaf Encyclopaedia. Nelson’s was still going strong in 1930 where a set cost $99.50 plus $6/year for updates — buy a set, get a free bookcase — Nelson’s stopped publishing updates sometime in the 1930s. Thomas Nelson & Sons is still around today, the world’s largest Christian publisher, but their company history curiously makes no mention of their innovative encyclopaedia.