The information from the Lithuania, LitvakSIG Census and family Lists from various districts, 1795-1900 for my family Izrel Zalmanzon provides the following reference:
Publication type 1904-1915-FL
Archive KRA/I-210/1/439
What does this mean, where are the archives and in what language are they?
Thanks.
Herman Salmenson

Hello Herman,
The standard archival designation is organized as archive/fond/inventory/file. Thus the example you gave works out to
KRA - the Kaunas regional archive (other archival abbreviations frequently encountered in Lithuanian records are LVIA, the state historical archive, and LCVA, the central state archive, both located in Vilnius)
I-210 - the number of the fond at KRA
1 - the number of the inventory (ie, a section) within that fond
439 - the number of the file within that inventory

Many Lithuanian records are online at familysearch.org, but not this specific file as yet. You would have to purchase a copy of your records from KRA (kaunas@...). The records would be in Russian as the area in question (Rokiskis) was part of the Russian Empire at that time.

Russ Maurer
Records Acquisition & Translation coordinator, LitvakSIG