Comparing crease and scratch marks on the cover of your printed copy with my copy on the computer, it's apparent that they are the same. Perhaps all internet versions originated from one copy uploaded by an anonymous individual. Certainly a nice, well-illustrated book. The "Golden" in the title suggests a book for children, though some of the experiments are at high school or college level. Reading it bought back memories of being a kid and going into the local drug store and buying a variety of useful chemicals, particularly potassium nitrate.