Published 1959. These are well used, some of the spines are damaged and have been taped but the inside pages are in good vintage condition. Extra volumes 1, 2, 4, 5, 6, 9, & 10. Biblio.com sells one of these for over $40 US. Perhaps these would be useful in an art project? The illustrations are nostalgic and interesting to look at. Volume 1 - Aardvark to Army Volume 2 - Arthur to Blood Volume 3 - Boats to Cereal Volume 4 - Chalk to Czechoslovakia Volume 5 - Daguerreotype to Epiphyte Volume 6 - Erosion to Geysers Volume 7 - Ghosts to Houseplants Volume 8 - Hudson to Korea Volume 9 - Labor Day to Matches Volume 10 - Mathematics to Natural Gas Volume 11 - Navy to Parasites Volume 12 - Paricutin to Quicksand Volume 13 - Rabbits to Signaling Volume 14 - Silk to Textiles Volume 15 - Thailand to Volcanoes Volume 16 - Wales to Zoos