Type D. u. Gut - Müssen is a Dorf und Gut (Village and Estate).

Lvl I Pr. - Level I shows which Kingdom or State the place is located in. Müssen is located in Preussen.

Prov Schlesw. -Holst. - The Province shows which Province or State the place is located in. Müssen is located in Schleswig-Holstein.

RB Schleswig - The Regierungsbezirk for Müssen is Schleswig. The Regierungsbezirk is a government district that is in hierarchy between the State and Kreis level.

Kr Hzt Lauenburg - The Kreis for Müssen is Hzt Lauenburg. A Kreis is a government district (similar to a U.S. county).

AG Schwarzenbek - The Amtsgericht for Müssen is in Schwarzenbek. The Amtsgericht is where the Lower District Court is located.

BKdo Lübeck - The Bezirkskommando for Müssen is in Lübeck. The Bezirkskommando is the District Military Command. You can look in the BKdo to find military records.

A Wotersen - The Amtsbezirk for Müssen is Wotersen. The Amtsbezirk is the District Office.

StdA Müssen 2) Lauenburg [self] - The Standesamt for Müssen is in itself. The Standesamt is where the Civil Registration Office is located.

Vgl Müsen - A Vgl (Vergleiche) notation lists places with similar spellings that you may want to compare. In this case, you may want to try searching for Müsen.