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O.C. Berg, C.F. Schmidt, Atlas. Off. Pfl., vol. 1 : p. 0, t. 0, fig. 0 (1891) [46]
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Glascow University Library, U.K.
O.C. Berg, C.F. Schmidt, Atlas. Off. Pfl., vol. 1 : p. 0, t. 0, fig. 0 (1891)
