Clearfield Ck. [creek] nr [near] Ashville, Cambria Co., Pennsylvania. (1904)GrayscaleClapp Nitrate Negative, Box 1
Terrace of Waynesburg S.S., Rich hill two, Greene Co., Pennsylvania. U.S. - disc. (1904)GrayscaleCla...
Washington Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Waterfall over Benwood L., ravine tributary to Meigs Ck. [creek], Washington Co., Pa. [Pennsylvania]...
Little Yellow Creek, Cambria Co., Pennsylvania. (1904)GrayscaleClapp Nitrate Negative, Box 1
Brobaker Run, Cambria Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Road washed out, Cambria Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Susquehanna R. [river], Curwensville, Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box...
Coal mine near Barnesboro, Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Coal pit & F.W. DeWolf, Greene Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Cultivated hillside, Washington Co., Pennsylvania. (1904)GrayscaleClapp Nitrate Negative, Box 1
Valley of ten mile creek, near Ten-Mile, Pennsylvania. (1904)GrayscaleClapp Nitrate Negative, Box 1
Jc. Susquehanna R. [river] & Anderson Ck. [creek], Curwensville, Pa. [Pennsylvania]. (1904)Grayscale...
Coal pit & F.G.C. [Frederick Gardner Clapp], Greene Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Ni...
F.G. [Frederick Gardner] Clapp and Allegheny R. [river], nr [near] Oakmont, Pa. [Pennsylvania]. (ca....
Washington field, Washington Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Terrace of Waynesburg S.S., Rich hill two, Greene Co., Pennsylvania. U.S. - disc. (1904)GrayscaleCla...
Washington Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Waterfall over Benwood L., ravine tributary to Meigs Ck. [creek], Washington Co., Pa. [Pennsylvania]...
Little Yellow Creek, Cambria Co., Pennsylvania. (1904)GrayscaleClapp Nitrate Negative, Box 1
Brobaker Run, Cambria Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Road washed out, Cambria Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Susquehanna R. [river], Curwensville, Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box...
Coal mine near Barnesboro, Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Coal pit & F.W. DeWolf, Greene Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Cultivated hillside, Washington Co., Pennsylvania. (1904)GrayscaleClapp Nitrate Negative, Box 1
Valley of ten mile creek, near Ten-Mile, Pennsylvania. (1904)GrayscaleClapp Nitrate Negative, Box 1
Jc. Susquehanna R. [river] & Anderson Ck. [creek], Curwensville, Pa. [Pennsylvania]. (1904)Grayscale...
Coal pit & F.G.C. [Frederick Gardner Clapp], Greene Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Ni...
F.G. [Frederick Gardner] Clapp and Allegheny R. [river], nr [near] Oakmont, Pa. [Pennsylvania]. (ca....
Washington field, Washington Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Terrace of Waynesburg S.S., Rich hill two, Greene Co., Pennsylvania. U.S. - disc. (1904)GrayscaleCla...
Washington Co., Pa. [Pennsylvania]. (1904)GrayscaleClapp Nitrate Negative, Box 1
Waterfall over Benwood L., ravine tributary to Meigs Ck. [creek], Washington Co., Pa. [Pennsylvania]...