Detail
Type Vw. - Jerkowo is a Vorwerk (Residence or Farm).
Kr Mogilno - The Kreis for Jerkowo is Mogilno. A Kreis is a government district (similar to a U.S. county).
See Twierdzyn - A See notation means the entry is dependent on another entry. In this case, Jerkowo is dependent on Twierdzyn, which should be consulted for additional information.