NTv2LSBB_LSA.gsb (Pulkovo 42(83)->ETRS89 for Sachsen Anhalt) can be included

[nyalldawson]

Available from https://lsbb.sachsen-anhalt.de/service/vermessung/

[rouault]

Download link: https://lsbb.sachsen-anhalt.de/fileadmin/Bibliothek/Politik_und_Verwaltung/Landesbetriebe/LSBB/PDF/Strasse/Bautechnik_Info/Strassenkarten/NTv2LSBB_LSA.zip
License: https://lsbb.sachsen-anhalt.de/fileadmin/Bibliothek/Politik_und_Verwaltung/Landesbetriebe/LSBB/Vermessung-Planmuster/DA-06-2017_A4.pdf , which is the well known Data licence Germany – attribution – version 2.0

[rouault]

WARNING: This repository is no longer open for adding new datasets. Starting with PROJ 7, the PROJ-data repository is the new home for PROJ datasets.

Go to its CONTRIBUTING instructions