ISBN 9780870444982 books & textbook
Small Inventions That Make a Big Difference (Books for World Explorers Series 5 No. 2)
National Geographic Society (U. S.) Crump, Donald J. Bailey, Joseph H. Huehnergarth, John
Natl Geographic Society /1984-01-01 Paperback / 104 Pages
isbn-10: 0870444980 / isbn-13: 9780870444982
