Both A. van den Berg Pzn. (son) and Pl. van den Berg (father) have been contributors to the VAKBLAD. Throughout this volume, the initials "v.d.B." have been interpreted as Pl. van den Berg. However, contributions to this article are signed respectively "P.v.d.B. "and "v.d.B."; this would suggest that "v.d.B.", without "P.", should precisely not be interpreted as Pl. van den Berg. Illustrations: architectural drawing/vulture pit; architectural drawings/calculations