Pp. 376, 23 full page plates – 4 are in color + pp. 103, 12 full page photo-plates. Contemporary full dark blue ribbed cloth with red cloth spine label that is lettered in gilt, lg 4to. Memoirs of the Boston Society of Natural History, volume 6, no. 3 + no. 4. The first work covers the northern Eurasian avifauna from Spitsbergen Island to the Chuckche Peninsula. The second work presents a thorough study of the “greater prairie chicken” that became extinct in 1931 with the final sighting on Martha’s Vineyard. These two important ornithological monographs are bound together with two others on coniferales (invertebrates) in the entire volume 8 of this memoir series. Mildly ex-library from the Reading Public Museum with their bookplate on the front endpaper, name-stamp on the rear endpaper and white call number on the spine, no other marks and no signs of use.