The database of 1681 working maps available here was taken from the linguistic atlas ALF ("Atlas linguistique de la France"), published between 1902 and 1910 by Jules Gilliéron and Edmond Edmont in 10 volumes. About 40% of the 1421 total maps of the ALF were used to produce the 1681 working maps.
In terms of linguistic categories, 1117 of the 1681 working maps belong to phonetics (477 to vocalism and 479 to consonantism) and 471 to lexicon (vocabulary).
The database of 3911 working maps available here was taken from the linguistic atlas AIS (Atlante Italo-Svizzero, recte: "Sprach- und Sachatlas Italiens und der Südschweiz"), published between 1928 and 1940 by Karl Jaberg and Jakob Jud in eight volumes. All 1705 original maps of the AIS were used for the production of the 3911 working maps, but with the consistent exclusion of AIS maps with too many missing data.
In terms of linguistic categories, of the 3911 working cards, 1766 belong to phonetics (873 to vocalism and 805 to consonantism) and 1225 to lexicon (vocabulary).
The database of 1524 working maps available here was taken from four “linguistic atlases” (AES, CLAE, LAE and WGE), all based on the "basic material" (i.e. the raw data presented in phonetic transcription) of the "Survey on English Dialects" (SED):
These "linguistic atlases" do not contain raw materials - in contrast to romanistic "atlas linguistiques" (etc.) - but rather materials "authoritatively" pre-typed by the respective authors. We have taken exactly these typings (“taxations”) without any changes from the respective map works.
The 1524 working maps quoted at the beginning come from the four "linguistic atlases" considered by us as follows: AES: 424, CLAE: 597, LAE: 389, WGE: 114.
Of the 1524 working maps, 689 belong to phonetics (of which 511 to vocalism and 178 to consonantism) and 447 to lexicon (vocabulary).