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I need to find out what projection this base-map has for digitizing the information that was drawn on it. It's from South Tyrol (South Tirol) in Italy. I have the following information:

Title: Provincia di Bolzano / Provinz Bozen Year: It was published 1980, so it could be anything before that

It has this overview: enter image description here

Next to it is has this code: 4 III NO-B

And the page number: Foglio 74 / Blatt 74

The x-coordinates are given like this: E=1650000

And the y-coordinates: N=5183000

At the bottom of the map it says (some sort of copyright notice):

  Questo supporto consente solo copie a luce fredda

  Cartogr. Autorizz. A norma di legge

And then it says:

  E.I.R.A.

  Ente Italiano rilievi aerofotogrammetrici

  Rilievo aerofotogrammetrico eseguito con strumenti "Galileo-Santoni"

Edit:

I did some research and it might be a Gauß-Boaga (Gauss-Boaga) or Roma 40 projection, but I'm not sure yet. Link: https://it.wikipedia.org/wiki/Proiezione_di_Gauss-Boaga

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The x-coordinates are given like this: E=1650000

And the y-coordinates: N=5183000

These coordinates are expressed in EPSG:3003 (Monte Mario / Italy zone 1), while Foglio 4 is an IGMI topographic map at scale 1:100k. The code 4 III NO-B reports the reference of the marked element at scale 1:5k, i.e. Foglio 4 (1:100k), 3rd quadrant (1:50k), North Western (1:25k), part B (1:5k).

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