1000 resultados para Dehmel, Richard, 1863-1920
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Digital Image
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Collection consists largely of minutes and correspondence from the office of the Jewish Immigrant Information Bureau which administered the Galveston Immigration Plan. Includes correspondence among members of the JIIB, the Industrial Removal Office, the Hilfsverein de Deutschen Juden (Relief Organization of German Jews), the Jewish Colonization Society (ICA), and various Jewish organizations in the United States. Collection also contains many ship passenger lists.
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Référence bibliographique : Rol, 58888
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Référence bibliographique : Rol, 59708
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Référence bibliographique : Rol, 59796
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von K. Grunsky
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Charcoal in unlaminated sediments dated by 210Pb was analysed by the pollen-slide and thin-section methods. The results were compared with the number and area of forest fires on different spatial scales in the area around Lago di Origlio as listed in the wildfire database of southern Switzerland since AD 1920. The influx of the number of charcoal particles > 75 µm2 in pollen slides correlates well with the number of annual forest fires recorded within a distance of 20-50 km from the coring site. Hence a size-class distinction or an area measurement by image analysis may not be absolutely necessary for the reconstruction of regional fire history. A regression equation was computed and tested against an independent data set. Its use makes it possible to estimate the charcoal area influx (or concentration) from the particle number influx (or concentration). Local fires within a radius of 2 km around the coring site correlate well with the area influx of charcoal particles estimated by the thin-section method measuring the area of charcoal particles larger than 20 000 µm2 or longer than 50 µm. Pollen percentages and influx values suggest that intensive agriculture and Castanea sativa cultivation were reduced 30-40 years ago, followed by an increase of forest area and a development to more natural woodlands. The traditional Castanea sativa cultivation was characterized by a complete use of the biomass produced, so abandonment of chestnut led to an increasing accumulation of dead biomass, thereby raising the fire risk. On the other hand, the pollen record of the regional vegetation does not show any clear response to the increase of fire frequency during the last three decades in this area.
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Sammy Gronemann
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Signatur des Originals: S 36/F07199
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"Prepared under the direction of Dr. William H. Davis, chief statistician for vital statistics, and under the immediate supervision of Richard C. Lappin, expert special agent of the Bureau of the Census.--Letter of transmittal, p. 5.
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"With introductions from Thackeray's English humorists'."
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Mode of access: Internet.
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Mode of access: Internet.