What Nature reserve number was established on 19961220 20.12.1996
CREATE TABLE table_26013618_1 (nsg_nr INTEGER, date_established VARCHAR)
SELECT MIN(nsg_nr) FROM table_26013618_1 WHERE date_established = "19961220 20.12.1996"
### Context: CREATE TABLE table_26013618_1 (nsg_nr INTEGER, date_established VARCHAR) ### Question: What Nature reserve number was established on 19961220 20.12.1996 ### Answer: SELECT MIN(nsg_nr) FROM table_26013618_1 WHERE date_established = "19961220 20.12.1996"