Aletschgletscher. (Maasstab 1:50,000 / 
Imfeld, Xavier.
[Berne] :  Eidgenössisches Stabsbureau, 
[1885]
Compiled from Sh. 489 and 493 of Topographischer Atlas der Sweiz ... By Hermann Siegfried.
In: Handbuch der Gletscherkunde, von ... A. Heim.
The map is in a pocket at the back of the volume.