By Johnson, Mark, Johnson, Helen
By Sanderson, Helen, Harrison, Jane, Price, Shirley
By Herbert, Helen, Godley, Nicholas
By Riley, Helen, Oxford Scientific Films
By Terrell, Helen
By Ringrose, Helen
By Mahy, Margaret, Craig, Helen
By Taylor, Helen
By Greathead, Helen
By Belmont, Helen
By Donohoe, Helen
By Graves, Sue, Jackson, Helen
By Lanz, Helen
By Cutler, Ivor, Oxenbury, Helen
By Oxenbury, Helen, Oxenbury, Helen
By Dunmore, Helen, Dainton, Paul
By Barden, Helen
By Muir, Helen, Birch, Linda
By Cresswell, Helen, Kavanagh, Peter, Helen Cresswell
By Muir, Helen
By Muir, Helen, Birch, L.