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1
Author: Steidle, Edward, 1887-1977.
Published 1950
Record Source: Published Materials
Subjects and Genres: '; “...Natural resources....”
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2
Published 1987
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources United States Periodicals....”
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3
Record Source: Published Materials
Subjects and Genres: '; “...Nature conservation United States Periodicals....”
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4
Published 1954
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Penn. Periodicals....”
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5
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Societies, etc. Periodical....”
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6
Author: Maunder, Elwood R.
Published 1976
Record Source: Published Materials
Subjects and Genres: '; “...Natural Resources Council of America....”
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7
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources...”

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8
Published 1976
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources....”
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9
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Pennsylvania Periodicals....”
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10
Published 1973
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources United States History....”
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11
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Pennsylvania Brandywine Creek Valley (Pa. and Del.) Periodicals....”
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12
Published 2009
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Pennsylvania....”
Access the project website.
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13
Author: Mitchell, Lee Clark, 1947-
Published 1981
Record Source: Published Materials
Subjects and Genres: '; “...Nature conservation United States History....”
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14
Published 1998
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Pennsylvania Periodicals....”
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15
Author: Brinkley, Douglas.
Published 2009
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources United States History....”
Contributor biographical information
Publisher description
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16
Author: Freeman, Orville L.
Published 1968
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources....”
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17
Published 1970
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Study and teaching....”
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18
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Pennsylvania Periodicals....”
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19
Author: Speakman, Joseph M., 1940-
Published 2006
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Pennsylvania History....”
Table of contents
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20
Published 1893
Record Source: Published Materials
Subjects and Genres: '; “...Conservation of natural resources Periodicals....”
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