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Multilingual
21
Pearce, Douglas, 326.399-P359t | Longman Scientific & Technical | 1992 326.399-P359t,
22
Hammond, J L., 336.22-H225t | Longmans | 1982 336.22-H225t,
23
Ashworth, William, 322.8-A831s | Longmans | 1981 322.8-A831s,