Operations were conducted on a series of 'Fronts' between Lake Garda and the Izonzo and the series has been organised to reflect this. Allied maps are arranged in groups of Topographical, Intelligence and Operations/Trench Maps for each Front, irrespective of the nationality of the producer. Enemy maps, which at the smaller scales cover most of the theatre of operations, are arranged topographically, whether or not they bear military overprints.
The codes listed below were first designed for the 1:75,000 series and later expanded to accommodate the 1:25,000 and 1:12,500 series, in some cases with the added suffix 'x'. A number of 1:25,000 and 1:12,500 maps were collated from maps produced in both the Austrian and the Italian system of cartography. Sheets at these scales were numbered in either or both of the "old" and "new" systems. The sheet numbers printed on the maps are are indicated in the catalogue, square brackets being used when "missing" numbers have been entered in MS. The "old" system depended upon three references:-
Z = Zone [horizontal grid location in Arabic numerals]
K = Kolonne [vertical grid location in Roman numerals]
S = Sektion [quarter location using cardinal points]
Maps at 1:75,000 usually have a reference number in the lower right corner of the sheet as listed in the 'Remarks' column.
Map features are identified in the catalogue by the use of codes as follows:
"K u k Militärgeographischen Institut" in bottom margin;
2 Austrian Military Survey unit as listed;
3 Reference number in lower right corner as listed;
4 Key to fortifications/defence works symbols in margin;
4x Key to topographical conventional signs in margin;
5 Key to colour-coded military conventional signs for Trench Lines etc in margin;
6 Base monochrome black/grey with form-lines and hachuring [normal Austrian mountain cartography];
6x Base monochrome black/grey with contours and rock drawing [normal Italian mountain cartography];
7 Base monochrome brown with form-lines and hachuring [normal Austrian mountain cartography];
7x Base monochrome brown with contours and rock drawing [normal Italian mountain cartography];
8 Woodland coloured green;
9 Woodland coloured light blue (over brown = green tint);
10 Water coloured dark blue;
11 Roads coloured brown/yellow;
11x Military roads/cable railways o/p in black/brown/violet;
12 Form-line heights in metres printed at margins;
13 Maps with reference grid;
14 Artillery Map;
15 Infantry Plan.
Codes have been used to reduce the excessive repetition of text in listing the Austro-Hungarian maps. In order to reduce the need for translations, a 'Glossary of German terms and abbreviations used on Austro-Hungarian maps' and an 'Explanation of Anglo-Italian Abbreviations' are in the standard list set, together with a contents list.
See also: "List of Principal Abbreviations used in Italian Maps" of Feb 1918 included in "Notes on Maps issued to British Forces in Italy, June 1918" (WO 369/1) and published loose in earlier editions (WO 369/33 and 34)