Offered for sale is this cover mailed in 1959 from Grand Forks Seed Co., Wholesale and Retail Seedsmen, of Grand Forks, North Dakota to First National Bank locally (says "City instead of Grand Forks).  This is a 4c embossed envelope with a Grand Forks slogan cancel-Strike Back at Cancer Give American Cancer Society.  This would be a nice item for a collector of North Dakota postal history

See the scan for details.