1930-1932 The Source Book Encyclopedia: Perpetual Pictured Loose-Leaf Extension. Used with wear and blemishes see pictures sold as is.
The extensions were published semi-annually. This listing includes the following suppliments
In overall good condition. Cover has scuffs, stains and wear. Edge wear. Binding screws have rust. First and last few pages have extensive wear, tears and tape. Light staining and page folds throughout.
Source Book was the most common name for a family of encyclopedias published in the 1910s through 1936.
In 1922 the rights to the encyclopedia were sold to the Perpetual Encyclopedia Corporation who thoroughly revised the set and republished it in 1924 as the Source Book; an international encyclopedic authority written from the new world viewpoint. In this edition the first seven volumes were encyclopedic and the final three were study guides. For sale is 5 extensions.