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Page 21 of at least 35
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Yellowstone photo album 31, page 20 Yellowstone National Park
Yellowstone photo album 30, page 20 Yellowstone National Park
Yellowstone photo album 31, page 5 Yellowstone National Park
Yellowstone photo album 5, page 76 Yellowstone National Park
Yellowstone photo album 5, page 20 Yellowstone National Park
Yellowstone photo album 5, page 27 Yellowstone National Park
Project 20, surfacing road Mammoth Cave National Park; National Park Service
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Circa 1935
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Circa 1935
Road before repair, no 102, project no. 20 Mammoth Cave National Park; National Park Service
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Circa 1934
Road before repair, no 102, project no. 20 Mammoth Cave National Park; National Park Service
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Circa 1934
1960-1970
1960/1970
Iron Values: Florida Bay Iron Values in Peat (81-XXI-20)
1960/1970
Distribution of Manganese Distribution of Manganese Along the Shark River (81-XVIII & XIX-20)
1960/1970
Persea X-Sect I 81-VII-20
1960/1970
Worldwide Sea Level Rise Since 5000 World-Wide Eustatic Sea-Level Rise since 5,000 (81-XXV-20)
1960/1970
Turkey Point, April 20, 1989 Biscayne National Park; National Park Service Turkey Point.
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1989-1989-04
Letter, 1815 March 20, Samuel Annin to Jacob Halderman Harpers Ferry National Historical Park; National Park Service
1815-03-20
1816-04-20
Shipment note to Harpers Ferry Amory, December 20 1843 [Recto] Harpers Ferry National Historical Park; National Park Service Rectangular, blue-lined notepaper. Statement dated December 20, 1843 to Harpers Ferry armories for barrel iron; includes deductions for shipping; note for receipt of check from merchants bank in Baltimore on January 12 1844. "Harpers Ferry armory, statement December 20, 1843" written on back. Small nick left border, slight separation on bottom border; red mark on bottom border, and ink smear on left side.
1843-12-20
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A Vigorous War Policy, Washington (D.C.), 1862 July 20 Fort Sumter and Fort Moultrie National Historical Park Article about new war policies under the Confiscation and Emancipation Acts.
Arrest of a Rebel Sympathizer, Baltimore (M.D.), 1862 July 20 Fort Sumter and Fort Moultrie National Historical Park Article about the arrest of rebel sympathizer C. C. Stevens and information of the passage of the steamship Star of the South.
Data from experiments on sand, sand bags, etc. and work relating to siege works, Morris Island, July-September 1863 National Park Service Tables of data from experiments measuring weights of dry and wet sand, data showing penetration of Sharps, Enfields, and Spencer Rifles and Coehorn mortar shells into materials such as sand bags, sand bags filled with cotton, facines, and pine. Also contains tables of data showing how much dirt can be dug by men in a period of time.
Page 15 National Park Service
Page 23 National Park Service
Page 25 National Park Service
Page 76 National Park Service
Page 88 National Park Service
Page 86 National Park Service
Virginius Island Trail Harpers Ferry National Historical Park Virginius Island Trail, Station # 20. Virginius Island, in Shenandoah at Harpe. Original caption: NHF-1622; Virginius Island Trail, Station 20; Photographer: Jack Boucher; June 1961; Wrapped around negative: Virginius Island Trml - Station #20 - Boucher - June 1965.
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1961-06
Park employees on swamp buggy pulling trailer through slough, September 20 1965 Everglades National Park; National Park Service Close up view of park employees on swamp buggy pulling trailer through slough; "Tiokol 'Imp' pulling loaded trailer"; "Film: Royal Pan (ASA 400); Equipment". Polyester Copy Negative.
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1965-09-20
Park employees in swamp buggy, September 20 1965 Everglades National Park; National Park Service Close up view of park employees in swamp buggy; "Thikol Sprit (off air strip), Zeb McKinney, Royal Pan (ASA 400)".
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1965-09-20
Three fires moving through trees Everglades National Park; National Park Service #5-72; Phantom fire; 3 fronts moving S.E. 2nd day; 2-20-72; 2-27-72
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1972-02-20
Litter sample in tall grass Everglades National Park; National Park Service On Slide: Litter sample; NBRM, CA; 20 Feb. 73; A-4; 053
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1973-02-20
Burned out bayhead after wildfire Everglades National Park; National Park Service Destroyed bayheads; wildfire #20 6-13-73; S. council fire tower
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1973-06-13
Massive burning area moving to trees Everglades National Park; National Park Service On Slide: SG #14; 2-20-74; A-2-a; 164
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1974-02-20
Fire damage, Building 45, Stagecoach Inn, roof, 1979 Harpers Ferry National Historical Park Fire Damage. Building 45. Fire, May 20, 1979 9:20 AM.
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1979-05-20
Fire damage, Building 45, Stagecoach Inn, 1979 Harpers Ferry National Historical Park Fire Damage. Building 45. Fire, May 20, 1979 9:20 AM.
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1979-05-20
Fire damage, Building 45, Stagecoach Inn, 1979 Harpers Ferry National Historical Park Fire Damage. Building 45. Fire, May 20, 1979 9:20 AM.
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1979-05-20
Plastic Apron-Gutter Will Improve Gum Grades for Naval Stores Producers University of Georgia Libraries vol. 20; Call number: ga f600 r4 s1 p2 n.20.
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1981-07
Charlestown Navy Yard, 1890-1973 Clemson University Libraries Call number: i29.86: 20/v.1.
Reef tract, aerial, April 20, 1989 Biscayne National Park; National Park Service Reef tract, aerial.
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1989-04-20
Status of Alaska Wetlands Clemson University Libraries Call number: i49.2: w53/20.

Page 21 of at least 35
About 1,700 Items

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