(from lawhighereducation.com/90-morrill-act.html):
Agricultural College Act of 1890 (Second Morrill Land Grant Act), ch. 841, 26 Stat. 417, 7 U.S.C. §§ 322 et seq.
Hatch Act of 1887, ch. 314, 24 Stat. 440, 7 U.S.C. §§ 361a et seq.
Morrill Land Grant Act of 1862, ch. 130, 12 Stat. 503, 7 U.S.C. §§ 301 et seq.
Smith-Lever Act of 1914, 7 U.S.C. §§ 343 et seq.