TY - GEN A1 - Porritt, George Taylor (1848–1927) PB - [unknown] PB - (Spottiswoode and Co. Ltd) N1 - 10 s. : 23 cm L1 - http://www.rcin.org.pl/Content/127091/PDF/WA488_159779_19746_s2253.pdf M3 - Text CY - London CY - (London) PY - 1906 KW - Insects - butterflies (Lepidoptera) - melanism phenomenon - near Yorkshire and Lancashire T1 - Melanism in Yorkshire Lepidoptera UR - http://www.rcin.org.pl/dlibra/publication/edition/127091 ER -