LETTER. 11 



Bulletins. 



15. Bulletin No. 1. — Plioceue Vertebrate Paleontology of I^orthern 

 Colorado, Cope, 28 pages, 8vo. 



16. Bulletin IsTo. 2. — Vertebrate Paleontology, Cope ; Cretaceous Flora, 

 Lesquereux, Acrididae, Thomas j Geography, Elevations, &c., Gardner; 



27 pages, Svo. 



Quarto publications. 



17. Vol. I. Contributions to the Extinct Vertebrata of the Western 

 Formations, by Prof. Joseph Leidy, 358 pages, with thirty-seven plates. 



18. Vol. II. The Vertebrata of the Cretaceous Formations of the 

 West, by Prof. E. D. Cope. 



19. Vol. III. The Vertebrata of the Eocene Formations of the West, 

 by Prof. E. D. Cope ; 40 plates. 



20. Vol. IV. The Vertebrata of the Miocene and Pliocene Forma- 

 tions of the West, by Prof. E. D. Cope ; 40 plates. 



21. Vol. V. Synopsis of the Acrididse of North America, by Prof. 

 Cyrus Thomas ; 258 pages, 4to, one plate. 



22. Vol. VI. Contributions to the Fossil Flora of the Cretaceous and 

 Tertiary Formations of the West, by Prof. J. S. Newberry ; 60 plates. 



23. Vol. VII. The Fossil Flora of the Cretaceous Formations of the 

 Western Territories, by Prof. Leo Lesquereux ; 30 plates. 



24. Vol. VIII. The Fossil Flora of the Tertiary Formations of the 

 Western Territories, by Prof. Leo Lesquereux ; 60 plates. 



25. The Fossil Invertebrata of the Western Territories, by F. B. 

 Meek; 45 plates. 



26. Sections, profiles, and other illustrations of the Geology of the 

 Western Territories explored by the survey, with descriptive text by 

 F. V. Hayden, in three parts. Part 1 contains about 75 plates of sec- 

 tions, &c. Part 2, 52 plates of scenery, prepared by the Albertype pro- 

 cess from the photographs of the survey. Part 3, 37 plates of the Hot 

 Springs, Geysers, &c., of Montana. A small edition of the profiles, sec- 

 tions, &c., one hundred copies have been issued without the text. 



Maps. 



1871. 1. Yellowstone Lake. 



2. Lower Geyser Basin of Firehole Eiver. 



3. Upper Geyser Basin of Firehole Eiver. 



4. Yellowstone National Park. 

 Notes by A. Schonborn. 



5. Parts of Idaho, Montana, and Wyoming Territories. (Prelim- 



inary map for field use.) 



1872. 6. Lower Geyser Basin of Firehole Eiver. (Scale, six inches to 



the mile.) 



7. Upper Geyser Basin of Firehole Eiver. (Scale as above.) 



8. Heury's Lake, Idaho. 



