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21“...The Pennsylvania grotto sculpin is known from just two caves of the Nippenose Valley in central...”
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22“...The Pennsylvania grotto sculpin is known from just two caves of the Nippenose Valley in central...”
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23“...The Pennsylvania grotto sculpin is known from just two caves of the Nippenose Valley in central...”
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27“...The radiocarbon laboratory at the University of Pennsylvania is sponsored jointly by the University...”
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31Subjects: “...University of Pennsylvania list;C 14;carbon;dates;isotopes;radioactive isotopes;absolute age...”
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32Published 1930Subjects: “...University of Pennsylvania. Museum of Archaeology and Anthropology...”
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33
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34by Saunders, Richard.Subjects: “...Almanacs -- Pennsylvania -- 1744...”
Published 1743
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35by United States. Works Progress Administration of Pennsylvania.Subjects: “...Bituminous coal--Pennsylvania--Maps...”
Published 1934
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36by United States. Works Progress Administration of Pennsylvania.Subjects: “...Bituminous coal--Pennsylvania--Maps...”
Published 1934
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37by United States. Works Progress Administration of Pennsylvania.Subjects: “...Bituminous coal--Pennsylvania--Maps...”
Published 1934
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38by United States. Works Progress Administration of Pennsylvania.Subjects: “...Bituminous coal--Pennsylvania--Maps...”
Published 1934
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39by United States. Works Progress Administration of Pennsylvania.Subjects: “...Bituminous coal--Pennsylvania--Maps...”
Published 1934
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40