Template:Heugel, 1855

• Heugel, C.A. 1855–1856. Beitrag zur Kryptogamenkunde der Ostsee-Gouvernements Russlands. Correspondenzblatt des Naturforschenden Vereins zu Riga 8(5): 73–79 (1855); 8(6): 81–94 (1855); 8(7): 105–110 (1855); 8(8): 119–127 (1855); 8(9): 129–141; 8(10): 163–167 (1855); 8(11): 169–178 (1855); 8(12): 185–204 (1855); 9(4): 45–49 (1856). hdl: 10062/46147 . hdl: 10062/46148 .  
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  • Mattick Rec.# 34449 – Recent Literature on Lichens