I've been skimming through some old copies of "16mil today", an association mag. which have been given to me. In an 'eighties edition the editor wrote of constructing a retaining wall on a garden layout by glueing stones together using "builders PVA glue". The picture suggests that the stones must have been about three inch by two inch size. Has any one in this group used such a technique, I can't believe it would survive but his general approach seemed to be that of a fairly practical character.
Ken.