from Natl Geographic Society (June 1, 1981)
9780870443343 |
details & prices | 1 pages | Rec. grade levels 3-4 | List price $8.50
About: Explains how a variety of products--such as kaleidoscopes, baseballs, marbles, matches, toothpaste, light bulbs, and bridges--are made, highlighting the ways in which manufacturing techniques have changed over the years.