CREATE TABLE table_73899 ("Institution" TEXT, "Location" TEXT, "Nickname" TEXT, "Founded" FLOAT, "Type" TEXT, "Enrollment" FLOAT, "Joined" TEXT)

in 1953, which of the institutions joined?
SELECT "Institution" FROM table_73899 WHERE "Joined" = '1953'
SELECT "Institution" FROM "table_73899" WHERE "Joined" = '1953'