00310nam a22001097a 4500003000400000005001700004008004100021040000800062050002000070245006900090260004100159OSt20180802104005.0180802b        xxu||||| |||| 00| 0 eng d  cN/A  aQ123b.H73 1974  aThe illustrated science and invention encyclopediabhow it works  aNew YorkbH.S. Stuttman Co Incc1974