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520 foot terrace and (shoveline?)

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1925-07-14

Allegheny Front

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1923-08-21

Allegheny Front, from Penn Highway

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1922-08-27

Allegheny Mountain

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1935-09-30

Allegheny Mountain

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1935-11-02

Allegheny River

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1926-08-27

Allegheny River

Subject	Topography
Creator	Johnson, Meredith E., 1897-
Date	1923-04-29

Along Freeport-Leechburg Road

Subject	Topography
Creator	Hughes, H. Herbert (Harry Herbert), 1905-
Date	1927-09-01

Along Interstate 80 on the Appalachian Plateau

Subject	Topography
Creator	Geyer, Alan R.
Date	1971

Along Leechburg-Freeport Road

Subject	Topography
Creator	Hughes, H. Herbert (Harry Herbert), 1905-
Date	1927-09-01

Appalachian Valley and McConnellsburg

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1922-08-22

Appalachian Valley from Lincoln Highway

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1922-08-22

Approaching Horseshoe Curve from south

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1923-08-21

Approaching ridge of Medina

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921-07-01

A scene taken from Cedar Ledge at Camp Nepahwin

Subject	Topography
Creator	Dinsmore, Arch
Date	1921-06-28

Bend in Turtle Creek - Pennsylvania Railroad yards

Subject	Topography
Creator	Johnson, Meredith E., 1897-
Date	1922-08-15

Big Gouldsboro Lake

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1922-08-06

Big Spring Creek at Newville

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1925-07-14

Big Spring Creek at Newville

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1925-07-14

Biological station along west side of Lake Wallenpaupack

Subject	Topography
Creator	Bolles, William H.
Date	1973

Biological station along west side of Lake Wallenpaupack

Subject	Topography
Creator	Bolles, William H.
Date	1973

Biological station grounds along west side of Lake Wallenpaupack

Subject	Topography
Creator	Bolles, William H.
Date	1973

Biological station grounds along west side of Lake Wallenpaupack

Subject	Topography
Creator	Bolles, William H.
Date	1973

Blacksmith shop

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1925-07-14

Blockhouse Fork of Little Pine Creek

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1931-02-01

Bluff of Lake Erie showing position of molding sand outcrop

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date

"Bracken fern"

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1923-08-21

Bridge, concrete, D. L. & W. Railway

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1922-08-13

Bridge on Lake to Sea Highway over Little Juniata River at Ironville

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date

Bridge over Bonnet Run

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1923-10-03

Brook in Triassic shales

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1926-07-16

Buchanan Valley looking northeast from head

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1922-08-20

Cabin and willows

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1925-07-14

Camp on Twin Island

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1922-10-01

Camp on Twin Island

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1922-10-01

Camp on Twin Island

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1922-10-01

Campus at Bryn Mawr College

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951

Canal and outcrop of Conococheague limestone

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1924-07-31

Carlim (at left) Lemont (timbered not mined) Lowville (right)

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date

Catskill topography

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1930-06-01

Catskill topography

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1930-06-01

Cayuga Valley

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1934-06-16

Cheat River just south of State Line Dam

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1923-06-07

Chickies Rock and Susquehanna River

Subject	Topography
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1925-06-12

Clarks Creek

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951

Clarks Creek

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1925-08-01

Clarks Creek

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951

Cliff across river from Beaver Falls

Subject	Topography
Creator	Corbin, J. Ross
Date	1925-11-02

Cliff across river from Beaver Falls

Subject	Topography
Creator	Corbin, J. Ross
Date	1925-11-02

Cliff below Dauphin

Subject	Topography
Creator	Ashley, Geo. H. (George Hall), 1866-1951