The images (so far) are from the beginning plates of Durand's Precis and the 1975 a+u issue featuring the work of Hejduk. I was surprised by the similarity of the first plans featured in both publications:
From there, images/details were chosen from following pages of each publication more or less in subsequent order, although more strictly following Durand than Hejduk. Mind you, only the thinnest layer of surface has been scratched in terms of Hejduk images available.
Stephen Lauf © 2016.03.13