table: 1-10335-1
columns: Camp, Estimated deaths, Operational, Occupied territory, Current country of location, Primary means for mass killings
Q: what's the current country of location with operational period  of summer of 1941 to 28 june 1944
A: SELECT Current country of location FROM 1-10335-1 WHERE Operational = 'Summer of 1941 to 28 June 1944'