1944. Lichens—their biological and economic significance. Botanical Rev. 10 (1): 1-65.
Pike, Warburton.
1917. The Barren Ground of northern Canada. [Ed. 2?] New York: xii + 334, 15 pl., 1 map. (Originally published in 1892.)
Pocock, R. I.
1911. On the specialized cutaneous glands of ruminants. Proc. Zool. Soc. London 1910: 840-986, 60 fig.
Polunin, Nicholas.
1949. Arctic unfolding. . . . London: 1-348, 33 pl., 3 maps.
Porsild, A. E.
1943. Reindeer and caribou grazing in Canada. Trans. Seventh No. Am. Wildlife Conference: 381-390, “1942.”
1950. A biological exploration of Banks and Victoria Islands. Arctic 3 (1): 45-54, 6 fig., 1 map.