- Bodemkaart van Nederland 1:50.000. Blad 12 Oost / Assen.

Stolp, J. et al. 1977. Stiboka, Wageningen. 169 pp. 33 fig./phot. 1 fold. pl. w. map, 1 fold. & col. soil map, plus the same map, not coloured. Orig. wrps. in plastic folder, very good.