File:Holzminden Camp Plan.jpg
Additional key:
Z = point of egress Medlicott-Walter escape.
F = officers' entrance B house.
E = orderlies' entrance B house.
D = postern gate.
Q = original point of egress of tunnel. Later blind alley.
Original publication: H.G. Durnford, The Tunnellers of Holzminden (Cambridge 1920), p. 53
H. G. Durnford