I love these books. I have four volumes of these Vintage 1940s editions of the How And Why Library: Nature, Heroes, Knowledge, and Travel. They are children's reference books. A fifth volume exists- Stories, which I would love to own someday. These books were published beginning in 1930, by the LJ Bullard Co. Mine are the 1945 edition. I adore the illustrations, especially the simple line art and art deco covers. I'll just post some photos of the various pages, and hope you enjoy them as much as I do.