"Mevrouw, de slanke lijn!" designer unknown dutch mid-thirties

B. Veldkamp and Joh. Veldkamp-Boendermaker. Mevrouw, de slanke lijn!. without year of publication. Printed in Batavia in Indonesia. Although there is no year of publication most probably printed in the 1930's. It sort of reminds me of Piet Zwart's "Kamergymnastiek voor iedereen". Although that publication misses the nice photographs in the book. Not very well known but a lot of fun to own.