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7Published 1817“...Journal of the Academy of Natural Sciences of Philadelphia (Online)...”
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11Published 1832Subjects: “...Natural Science Disciplines....”
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12Published 1918Subjects: “...Natural Science Disciplines Germany....”
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13Published 1871Subjects: “...Natural Science Disciplines Germany....”
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15Published 1924Subjects: “...Natural Science Disciplines. https://id.nlm.nih.gov/mesh/D010811...”
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16Published 1992“...Natural sciences education (Online)...”
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17Published 1992“...Natural Sciences education (Online)...”
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