No tax levied upon the recordation of mortgages, deeds of trust, and instruments of like character shall be levied upon or collected from any corporation or association engaged exclusively in making farm or crop loans, with respect to any instrument executed to secure a loan made by it to one of its stockholders or members for general agricultural purposes, the provisions of any other law to the contrary notwithstanding. The exemption provided herein shall apply to all deeds, mortgages, and instruments of like character executed to those corporations and associations created and chartered under the provisions of that act of Congress known as the Federal Farm Loan Act, as amended by the Farm Credit Act of 1933.