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1. Before 1957  (552)
2. 1957 To 1973  (866)
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New Records 

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Subject 

1. Field Notes  (832)
2. Ornithology  (791)
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6. Erhebungstechniken Und Analysetechniken Der Sozialwissenschaften  (655)
7. Methods And Techniques Of Data Collection And Data Analysis, Statistical Methods, Computer Methods  (612)
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15. Field Archaeology  (288)
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17. Bird Banding  (258)
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Databases 

1. Europeana Collections  (3,449)
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7. DOAJ Directory of Open Access Journals  (28)
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11. ROAD: Directory of Open Access Scholarly Resources  (16)
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14. Loughborough University Institutional Repository  (10)
15. Loughborough University Institutional Repository Open Access  (10)
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19. Calhoun: The NPS Institutional Archive  (7)
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Language 

1. English  (3,320)
2. German  (1,288)
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