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by Malory, Thomas; Cooper, Helen
by Bülow, William; Frowe, Helen; Matravers, Derek; et al.
by Slaney, Helen; Harrison, Thomas
by Docherty, Helen; Docherty, Thomas
by Thomas, Helen
by Piegorsch, Walter W.; Levine, Richard A.; Zhang, Hao Helen; et al.
by McDougal, Susan; Harris, Pat; Thomas, Helen