Published in E.J. Halsema--colonial engineer (X). (1987)

Published in E.J. Halsema--colonial engineer (XI). (1987)

Published in The memoirs of Apo Crosby (II). (1987)

Published 1986

Published in E.J. Halsema--colonial engineer (IX). (1986)

Published in E.J. Halsema--colonial engineer (VIII) . (1986)

Published in E.J. Halsema--colonial engineer (VII). (1986)

Published 1985

Published 1985

Published 1985