from
http://www.cr.nps.gov/history/hisnps/NPSHistory/timeline.htm , with some editing to remove non-park-establishment acts.
1964
Aug. 27 Ozark National Scenic Riverways, Missouri
Aug. 30 Fort Bowie NHS, Arizona
Aug. 31 Allegheny Portage Railroad NHS, Pennsylvania
Aug. 31 Fort Larned NHS, Kansas
Aug. 31 John Muir NHS, California
Aug. 31 Johnstown Flood NMem, Pennsylvania
Aug. 31 Saint-Gaudens NHS, New Hampshire
Sept. 11 Fire Island NS, New York
Sept. 12 Canyonlands NP, Utah
Dec. 31 Bighorn Canyon NRA, Wyoming and Montana
1965
Feb. 1 Arbuckle NRA, Oklahoma (incorporated in Chickasaw NRA 1976)
Feb. 11 Curecanti NRA, Colorado
March 15 Sanford NRA, Texas (redesignated Lake Meredith Recreation Area 1972; redesignated Lake Meredith NRA 1990)
May 15 Nez Perce NHP, Idaho
June 5 Agate Fossil Beds NM, Nebraska
June 28 Pecos NM, New Mexico (incorporated in Pecos NHP 1990)
July 30 Golden Spike NHS, Utah (designated 1957)
Aug. 12 Herbert Hoover NHS, Iowa
Aug. 28 Hubbell Trading Post NHS, Arizona
Aug. 31 Alibates Flint Quarries and Texas Panhandle Pueblo Culture NM, Texas (redesignated Alibates Flint Quarries NM 1978)
Sept. 1 Delaware Water Gap NRA, Pennsylvania and New Jersey
Sept. 21 Assateague Island NS, Maryland and Virginia
Oct. 22 Roger Williams NMem, Rhode Island
Nov. 11 Amistad Recreation Area, Texas (redesignated Amistad NRA 1990)
1966
March 10 Cape Lookout NS, North Carolina
June 20 Fort Union Trading Post NHS, North Dakota and Montana
June 30 Chamizal NMem, Texas
July 23 George Rogers Clark NHP, Indiana
Sept. 9 San Juan Island NHP, Washington
Oct. 15 Guadalupe Mountains NP, Texas
Oct. 15 Pictured Rocks NL, Michigan
Oct. 15 Wolf Trap Farm Park for the Performing Arts, Virginia
Nov. 2 Theodore Roosevelt Inaugural NHS, New York
Nov. 5 Indiana Dunes NL, Indiana
1967
May 26 John Fitzgerald Kennedy NHS, Massachusetts
Nov. 27 Eisenhower NHS, Pennsylvania
1968
April 5 Saugus Iron Works NHS, Massachusetts
Oct. 2 Appalachian NST, Maine, New Hampshire, Vermont, Massachusetts, Connecticut, New York, New Jersey, Pennsylvania, Maryland, West Virginia, Virginia, Tennessee, North Carolina, Georgia
Oct. 2 Lake Chelan NRA, Washington
Oct. 2 North Cascades NP, Washington
Oct. 2 Redwood NP, California
Oct. 2 Ross Lake NRA, Washington
Oct. 2 Saint Croix National Scenic Riverways, Minnesota and Wisconsin
Oct. 17 Carl Sandburg Home NHS, North Carolina
Oct. 18 Biscayne NM, Florida (incorporated in Biscayne NP 1980)
1969
Jan. 20 Marble Canyon NM, Arizona (incorporated in Grand Canyon NP 1975)