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Willem on Apterygota
Published in Psyche: A Journal of Entomology, in 1901, in volume 9, issue 305, pages 252
Created: 2016-06-19, modified: 2016-06-19
The carbobiferous flora of Peru
Published in Bulletin of the British Museum (Natural History). Geology., in 1954, in volume 2, issue 5, pages 189-224
Created: 2021-05-12, modified: 2021-05-12