Astronomy Magazine issue featuring article by Hawking's biographer Kitty Ferguson and an 'Ask Astro' answer by Hawking 1989
'National' portable typewriter No 5, by the National Typewriter Company, Wisconsin, United States of America, 1916 'National' portable typewriter No 5 1916-1920
Case 'L' agricultural tractor on steel wheels with spade lugs and road bands, by the J.I. Case Company Incorporated, Racine, Wisconsin, U.S.A., Serial No. L 324483, 1931. Engine: 26/40 hp 4-cylinder overhead valve gasoline (petrol)/kerosene. Case model 'L' 47hp tractor, 1931. 1931
'National' portable typewriter No 5, by the National Typewriter Company, Wisconsin, United States of America, 1916 'National' portable typewriter No 5 1916-1920