Text ( visual ) : unmediated Agricultural geology / by R.H. Rastall. -- Cambridge : at the University Press , 1916. -- ix, 331 p. : ill. ; 23 cm. -- (Cambridge geological series). -- (BA25427064) ; https://ci.nii.ac.jp/ncid/BA25427064 Author Heading(s): Rastall, R. H. (Robert Heron)