Figs. 1, 2. From His-Rütimeyer, Crania helvetica.
Figs. 3, 4. From v. Hölder, Schädelformen.
Figs. 7-10. From the collection of skulls in the Sammlungen für Tier- und Völkerkunde, Dresden, Anth. Abteilung.
Figs. 11, 13, 15, 19, 21a, 21b, 125a, 125b, 128a-129c. Photos: Prof. Lundborg's Collection, Upsala.
Figs. 26, 108. Drawing: Prof. Hans Dahl.
Fig. 30. Bryn Collection, Drontheim.
Figs. 34a, 34b. Photos: Walcher.
Figs. 35a, 35b. Photos: Collection of the Danish Anth. Commission, Copenhagen.
Figs. 37, 39, 56, 57, 61, 63, 70, 72, 73, 88, 112, 130, 142, 143, 159, 192a, 192b, 193. Photos: von Eickstedt.
Fig. 41. From Struck, Kriegsgefangene, Dietrich Reimer, Berlin.
Figs. 54, 79. From the collection of skulls in the Naturhistorisches Museum, Vienna. Photos: Wastl.
Figs. 58, 62, 114, 115, 137, 157. From Stiehl, Unsere Feinde.
Fig. 68. From Haberlandt, Die Völker Europas u. des Orients, Biogr. Inst., Leipzig.
Fig. 74. Engraving: Raimondi.
Figs. 76-78, 91. Photos: Gratl, Innsbruck.
Fig. 82. Photo: Johannes, Partenkirchen.
Figs. 83, 106. Photos: Ruf, Freiburg.
Fig. 87. Photo: Verein für österr. Volkskunde, Vienna.
Figs. 90, 93, 134, 146, 180, 252, 253, 269, 287, 295, 296. Drawings: Vogel v. Vogelstein.
Fig. 95. Photo: Frl. Huber, Anth. Inst., Vienna.
Fig. 98. Photo: Gnädinger, Feldkirch.
Figs. 100-103. Photos: Prof. Frizzi, Anth. Gesellsch., Vienna.
Figs. 104a, 104b. Photos: Dr. Ammon, Karlsruhe.
Fig. 105. Photo: Carle, Triberg.
Figs. 111a, 111b. Photos: Prof. Dr. Lenz.
Fig. 113. Photo: Kunstverlag H. Huber, Munich.
Fig. 117. Photo: Hofrat Toldt's Collection, Vienna.
Figs. 120, 121-124, 126a-127b. After Retzius, Finska Kranier.
Figs. 133, 148. Drawings: Dr. Haenel.
Fig. 135. Drawing: Prof. Krukenberg.
Fig. 136. Drawing: Engel-Baiersdorf.
Figs. 139, 285, 289. From the Corpus Imaginum of the Phot. Ges., Charlottenburg.
Fig. 145. Photo: Alexander.
Fig. 151. From Quatrefages and Hamy, Crania ethnica.
Figs. 152, 154, 186a, 186b. Photos: Anth. Inst., Vienna.
Fig. 153. Photo: Prof. v. Luschan, Berlin.
Fig. 160. Litho: Gorbunov.
Figs. 164-166. From Delitzsch, Babel und Bibel.
Fig. 181. After Martin, Lehrbuch d. Anthropologie.
Figs. 195, 198-199. From L'Anthropologie, 1900.
Fig. 200. From Hüsing, Völkerschichten in Iran. Photo: Anth. Gesellsch., Vienna.
Fig. 209. From Sieglin, Ausgrabungen in Alexandria.
Fig. 297. Photo: Hanfstaengl, Munich.
Fig. 301. Photo: K. Ganz, Zurich.
Maps I-V. From Halfdan Bryn, To grundracer i Norge (Nyt Magasin for Naturvidinskaberne, 1920).
Maps VI-XIV. Dr. Bernhard Struck, Dresden.
Map XVII. After Montelius.
Map XIX. After Putzger.
Map XX. After Meitzen and Schlüter.