Keys of knowledge verschenen in het stripblad Popeye
Datum Vn Titel L Nr.
05-63 W1 The sea-going canoe 1
63-68
02-64 W2 Fish 1/3
64-71
02-65 W3 People of Asia The Japanese 1
65-75
05-65 W4 Physical Fitness Co-ordinator 1
65-76