The Hamburg region contains four distinct subregions, each with its own set of sources.
Hamburg
In Hamburg, the primary task was assigning villages to subdivisions of Hamburg. The German Wikipedia article on Landherrenschaft (and articles it links to) provided most of that information. In the few cases in which villages were transferred from Holstein to Hamburg, the 1855 Schröder and Biernatzki gazetteer for Holstein documented the jurisdictional changes. The two volumes can be found here:
- 1: Topographie der Herzogthümer [Herzogtümer] Holstein und Lauenburg, des Fürs… – Google Books
- 2: Topographie der Herzogtümer Holstein und Lauenburg des Fürstentums Lübeck u… – Google Books
Harburg
The creation and dissolution of the Principality of Harburg is documented in the German Wikipedia article “Fürstentum Lüneburg“. To assign villages to subdivisions in Harburg, I relied on the following 1858 publication from U.F.C. Banecke:
I identifed (or inferred the identity of) the villages that switched from Tostedt to Hollenstedt from Chronik des Amtsgerichts Tostedt – ausführlich – | Amtsgericht Tostedt (niedersachsen.de).
Hadeln
To assign villages to the subdivisions of Hadeln, I relied on the fifth volume (1808) of Johan Ernst Fabri’s Geographie für alle Stände available here:
Geographie für alle Stände – Google Books
I identified the countries to which Hadeln belonged from the German Wikipedia article on Land Hadeln.
Bremen
The primary source for Stadt Bremen was the following 1900 volume by Franz Buchenau: Die freie Hansestadt Bremen und ihr Gebiet – Google Books. For clarification that the villages of Dünge and Lesembrok were not assigned to Hannover-Bremen despite their northern location, I relied on Grambke heute, gestern & vorgestern | Geschichte von Dunge und Lesumbrok (bremen-grambke.de).