Arie Roos wordt geheim agent 

• 1961 
• 31 a 
• Hout, Willem H.M. van den 
• Bob Evers gebonden 

After part 27, no more illustrations were included in the books themselves. Variant A with "brown" cut. See 3rd photo for the difference. Could be a printing round or that the Eekhoorn (and before that Stenvert) used various printing companies.

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