Oxford Dictionary of Business English:

Here are the DDC (Dewey Decimal Classification) call numbers for each non-fiction book:

1. Oxford Dictionary of Business English:

   • This book combines language (English for specific purposes) and business. The DDC for English for specific purposes is 428.24.
   • Call Number: $\boxed{\text{428.24}}$

2. Encyclopaedia of Papua New Guinea:

   • Regional encyclopedias are classified with the history and geography of that region. Papua New Guinea is in Oceania. The DDC for the history and geography of Papua New Guinea is 995.3.
   • Call Number: $\boxed{\text{995.3}}$

3. The World Encyclopaedia Vol. II:

   • General encyclopedias are classified under general works. The DDC for general encyclopedic works is 030.
   • Call Number: $\boxed{\text{030}}$

4. Business Letter Writing:

   • This falls under business communication. The DDC for business communication is 651.7.
   • Call Number: $\boxed{\text{651.7}}$

5. The History of the World:

   • General world history is classified under history. The DDC for general world history is 909.
   • Call Number: $\boxed{\text{909}}$

6. The Biography of Carol Kidu:

   • Individual biographies are classified under biography. The DDC for individual biography is 92.
   • Call Number: $\boxed{\text{92}}$

7. The Art of Sepik Carvings:

   • This is art from a specific region (Sepik, Papua New Guinea). The DDC for the arts of Papua New Guinea is 709.953.
   • Call Number: $\boxed{\text{709.953}}$

8. The New Testament:

   • This is a specific part of the Christian Bible. The DDC for the New Testament is 225.
   • Call Number: $\boxed{\text{225}}$

9. Symptoms and Treatment of Malaria:

   • This falls under medicine, specifically diseases. The DDC for malaria is 616.9362.
   • Call Number: $\boxed{\text{616.9362}}$

10. Tribal Societies' Tools:

    • This relates to the technology and culture of tribal societies, falling under anthropology. The DDC for technology in a cultural context is 306.46.
    • Call Number: $\boxed{\text{306.46}}$