Arlene, your mention of Friedrichsfelde has me somewhat confused. Friedrichsfelde was a small town just to the east of Berlin in Brandenburg. In 1920, seven small cities and countless small towns surrounding Berlin, including Friedrichsfelde, were annexed by Berlin, creating the Greater Berlin we know today. Friedrichsfelde is part of Berlin's rather gray, nondescript Lichtenberg district, which, until the fall of the Wall, was in East Berlin. Naturally, you would have found the small town of Friedrichsfelde on a pre-1920 map, but I'm puzzled when you say that you've also found it on a recent map. On any recent map, it would simply be a neighborhood in Berlin.
To me, Friedrichsfelde makes little sense as your great-grandmother's place of birth. Her obituary indicates that she was baptized in Stramehl. Had your great-grandmother been born in Friedrichsfelde just outside Berlin, what reason might her parents have had to then take the baby to little Stramehl in Pomerania, about 110 miles away, to be baptized? And further, in the 19th century for a family to have moved from Friedrichsfelde outside Berlin to Wangerin in Pomerania would have been a rather odd move somehow.
With your great-grandmother having been baptized in Stramehl and having grown up in Wangerin, why does Friedrichsfelde, 110 miles away just outside Berlin in Brandenburg, make more sense to you as her birthplace than does Friederickenwalde, which is right there, only a few miles from Stramehl and Wangerin?
There was a small village of about 150 people not far from Friederickenwalde/Stramehl/Wangerin in Pomerania called Friedrichsfelde. This Friedrichsfelde was southwest of Wangerin, in the Administrative District (Kreis) of SAATZIG. This Friedrichsfelde now goes by the Polish name WIERZCHUCICE. Saatzig now goes by the Polish name SZADZKO. I suppose this Friedrichsfelde could be a possibility as the birthplace of your great-grandmother, although it isn't as close to Stramehl and Wangerin as Friederickenwalde is, and it is in a different "Kreis".
As to books on Pomeranian history, I don't know of any in English. But I will be on the lookout. Here are a couple websites you might find interesting:www.donicht.dewww.bogenschneider.org/pomerania.htmwww.geocities.com/regenwalde/
The following web page will be a map of the Kingdom of Prussia with its provinces within Germany. If you look towards the northeast, you can see just how Pomerania (Pommern) fit in:www.deutsche-schutzgebiete.de/webpages/Koenigreich_Preussen....
And also don't forget that here at Ancestry.com, there is a Prussia-Pomerania Message Board. Now that you know how all the place names are correctly written, maybe you'd want to post some kind of a message on that board.