Publications of the United States Government. 67 



Twentieth Annual Report of the United States Geological Sur- 

 vey, 1898-99; by Charles D. Walcott, Director. 1899. 

 (Parts II, III, IV, V, and YII, 1900.) 7 pt. in 8 vol. 

 551 pp., 2 maps; v, 953 pp., 193 pi. and maps; v, 595 pp., 

 78 pi. and maps; vii, 660 pp., 75 pi. and maps; xix, 498 

 pp., 159 pi. and maps; viii, 616 pp.; xi, 804 pp., 1 pi.; 

 V, 509 pp., 38 pi. and maps. 



; Part II. Status of the Mesozoic floras of the United States ; by 



'■ L. F. Ward, with the collaboration of William M. Fountain, Atreus 



Wanner, and F. H. Knowlton. pp. 211-748, pi. 21-179. 



Part IV. Mineral resources of the United States, 1898 ; by 



David T. Day. 



I Twenty-first Annual Report of the United States Geological 

 - Survey, 1899-1900 ; by Charles D. Walcott, Director. 1900. 



7 pt. in 8 vol. 



Part VI. Mineral resources of the United States, 1899 ; bj' 

 David T. Day. 



Twenty-second Annual Report of the United States Geological 

 Survey. 



Part I. The asphalt and bituminous rock deposits of the United 

 States; by George H. Eldridge. pp. 219-452, pi. 25-58. 



Part III. The coal fields of the United States ; by C. W. Hayes, 

 pp. 7-24, pi. 1. 



Part III. The Pacific Coast coal fields; by G. O. Smith, pp. 

 473-515, pi. 31-34. 



MONOGRAPHS. 



^lonographs, vol. XIII. Geology of the quicksilver deposits of 

 the Pacific Slope, with atlas ; by George F. Becker. Wash- 

 ington, 1888. xix and .486 pp. 7 plates, with atlas of 14 

 sheets. 



The general heading of the chapters of this work are as follows : 

 Chapter I. Statistics and history. 



II. Notes on foreign occurrence of quicksilver. 

 III. Sedimentary rocks. 

 IV. The massive rocks. 

 V. Structural and historical geology of the quicksilver belt. 

 Appendix to Chapter V, Remarks on the genus 

 Aucella, with special reference to its occurrence in 

 California, by C. A. White. 

 VI. Descriptive geology of the Clear Lake region. 

 VII. Descriptive geology of Sulphur Bank. 

 VIII. Descriptive geology of the Knoxville district. 

 IX. Descriptive geology of the New Idria district. 

 5-B 



