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10473 documents, page 1 of 1048

FINCAS Y PALMERAS DEL PAMBASO [Material gráfico]

Anonymous (1925)
EDITA SOUVENIR EUROPA HOTEL LAS PALMAS. ADQUIRIDA POR EL COLECCIONISTA EN LAS PALMAS DE G.C. FOTO POSTAL DE "LAS PALMAS" (VERDOSA) Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte. Subdirección General de Coordinación Bibliotecaria, 2015

The secondary emission from a nickel surface due to slow positive ion bombardment

Klein, A. L. (1925)
The apparatus was arranged so that positive ions from a heated Mo strip coated with aluminum phosphate, were accelerated radially through slots in shields A and B, and a wider slot in an electrode C to the target T, from which the secondary emission to the electrode C was measured. The parts A, B, C and T were all concentric nickel cylinders, symmetrically placed about the emitter. If the potential of the emitter is made zero and the accelerating potential V1, when the collector is at zero po...

De Anthozoa uit het Maastrichtsche Tufkrijt

Umbgrove, J.H.F. (1925)
Behalve uit de koralen, die ik ter plaatse verzameld heb, werd het studiemateriaal samengesteld uit de verzamelingen der Rijks-Geologische Musea der Universiteiten te Leiden, te Utrecht en te Groningen en uit die der Landbouwhoogeschool te Wageningen. Verder uit de collectie van Teyler’s Stichting te Haarlem, van het Natuur-Historische Genootschap in Limburg en de Stadsverzameling in het „Athenaeum”, beiden te Maastricht. Bovendien heb ik de uitgebreide collectie van het Musée Royal d’Histoir...