Author
Great Britain Ordnance Survey
3
United States Army. Engineer Regiment, 29th
3
Anne S.K. Brown Military Collection
1
Aquaterra n.v
1
Belloc, Hilaire, 1870-1953
1
C.S. Hammond & Company
1
Chasseaud, Peter
1
Ellis, Geo. E
1
France Armée. Service géographique
1
France Mission centenaire 14-18
1
Geographia Ltd
1
Germany Heer. Stoverm IV. Geologengruppe
1
Germany Heer. Vermessungs-Abteilung 24
1
Gross, Alexander, 1879-1958
1
Institut national de l'information géographique et forestière (France)
1
Jacobson, Jos
1
Leopold Verger & cie
1
Memorial Museum Passchendaele 1917
1
R. Norris Williams World War I Collection (University of Pennsylvania)
1
Triad Pub. Co
1
United States Army. American Expeditionary Forces. General Headquarters. Operations Section. Map Room
1
United States War Department. General Staff
1
Willams, Arch B
1