EditorialStella Polaris, Approach to Polaris detection, Fig. 8, p. 47, Johann Heinrich Voigt: Der kunstg?nstigen Einfalt mathematischer Rarit?ten erstes [- drittes] Hundert [...]. Hamburg: gedruckt und verlegt bey Georg und Hanss Jacob Rebenlein, 1668-1673.
EditorialUrsus polaris. The polar bear. Musei Leveriani explicatio, Anglica et Latina (containing select specimens from the museum of ... Sir A. Lever), etc. vol. 1, vol. 2, pp. 1-48. Impensis Jacobi Parkinson: [London,] 1792, 96. 1792. Source: 40.e.15 plate 7.
EditorialPolar bear, Ursus maritimus (Ursus polaris) on an ice flow. Vulnerable. Lithograph by Karl Joseph Brodtmann from Heinrich Rudolf Schinz's Illustrated Natural History of Men and Animals, 1836.