By Helmholtz, Hermann von, Cahan, David
By Hughes Shirley
By Studlar, Gaylyn
By Andrews, Jonathan, Briggs, Asa, Porter, Roy, Tucker, Penny, Waddington, Keir
By Chambers, Robert
By Handelman, Howard
By Ansari, Aziz, Klinenberg, Eric
By Dreze, Jean
By Devereux, Stephen, Maxwell, Simon
By Welch, Jane Aikman
By Clare, John D., Griffith, Ieuan
By Debary, W T
By Howson, Bryan
By McCully, Patrick
By Gailey, Harry A.
By Sokolnikoff, Ivan S., Redheffer, Raymond M.
By Hughes, Shirley
By Weiler, J. H. H.
By Fiona MacCarthy
By Mellanby, Helen
By Butterworth, Neil
By Buczacki, Dr Stefan, Gardening, Amateur
By Eynon, Bob
By Adu, Philip
By Swinton, John, Mowat, Harriet
By Somjee, A. H., Rasmussen, Jørgen Gulddahl
By Lull, James
By Dickson, David, Hargie, Owen, Saunders, Christine
By Semat, Henry