By Chapman, P.
By Joan Solomon
By The Science Museum
By J.F. Wilkinson
By Peter McDonald, R Edwards, J.F.D. Greenhalgh, Colin Morgan, Liam Sinclair
By Jerome D. Belanger, Sara Thomson Bredesen
By Coles, K.Adlard, Sylvester-Bradley, David, Bradley, David Sylvester
By Burbules, Nicholas, Callister Jr., Thomas
By Reader's Digest
By Harold Hall
By Stan Bray
By F. N Howes
By Joe Suzuki
By Chiara Frugoni, William McCuaig
By David F. Bates
By Mark Duginske
By L.O. Roth, etc., H.L. Field (Oklahoma State University, USA)
By R. B. H. Wills, W.B. McGlasson, Douglas Graham, T.H. Less, E.G. Hall
By M. E. Adams
By Herriot, James
By James B. Beard
By Stuart Bladon, Gordon Horner
By W. Holmes
By Roger Balls
By J Maud Kordylas