SELECT MIN(population) FROM table_name_64 WHERE type = "m" AND name = "saint-blaise-sur-richelieu" AND area__km_2__ < 68.42
Saint-blaise-sur-Richelieu lebih kecil dari 68,42 km^2, berapa populasi kotamadya M jenis ini?
CREATE TABLE table_name_64 (population INTEGER, area__km_2__ VARCHAR, type VARCHAR, name VARCHAR)