All sales of land for failure to pay taxes held or conducted by any sheriff or any tax collector of any county, city, town, or other municipality during the year 1930, on any day subsequent to or other than the first Monday in June of said year, are hereby approved, confirmed, validated, and declared to be proper, valid, and legal sales of such land and legally binding in all respects, and all certificates of sale made and issued upon and in accordance with such sales are hereby approved and validated to all intents and purposes with such full force and legal effect as if said sales had been held and conducted on said first Monday of June, 1930. (1931, c. 160; 1971, c. 806, s. 1; 1987, c. 777, s. 4(1).)