05/13/1975
https://www.presidency.ucsb.edu...
"I do hereby designate Wednesday, October 9, 1974, as Leif Erikson Day."
"Let us draw inspiration from the indomitable spirit and undaunting determination of Leif Erikson."
"I am honored to comply with the request of the Congress of the United States."
"I invite the people of the United States to honor the memory of Leif Erikson on that day."