[Ger-Poland-Volhynia] pedigree database

[Ohgrmtns at aol.com]

I have been searching the Pedigree Database and have come across a source I  
do not understand. I have encountered the source as "SGGEE018." Can anyone 
tell  me what this source is and where I can find it?
 
 
Kristen FEIFERT Clark

Researching : (P)FEIFERT, STIEBNER,  NEUBERT, KOCHAN
Searching: Nedbajewka, Rohrbach(Berjozowka), Gruental,  Kutuzowka