BIVBRS AND LAKES NORTH AMERICA 97 



1008. Parsons, W. J., jr. 



1940. Ice in the northern streams of the United States. Trans. 



Amer. geophys. un. 21 :970-973. 



1009. *Record of ice break-up on Rock Lake, Jefferson County, Wisconsin. Data 



from 1887 to 1940. (Mss. in Dept. of Wildlife management, 

 University of Wisconsin College of agriculture.) 



1110. *Shipraan, T. G. 



1938. Ice-conditions on the Mississippi River at Davenport, Iowa. 



Amer. geophys. un. 19:590-594. [Tables for 1841/42- 

 1934/35.] 



1011. Swenson, Bennett. 



1942. Opening and closing dates of river-navigation in the United 



States. Mon. weath. rev. 70:280. [Tables of average, 

 earliest and latest closing and opening dates; average, 

 maximum and minimum period of suspended navigation, 

 for 14 places on 6 rivers.] 



1012. U. S. Engineer department. 



1932-1941. Annual reports of Chief of Engineers, U. S. Army. Ft. 2. 

 Commercial statistics water-borne commerce of the United 

 States for the calendar year 1932-1941. 10 v. [Navigation 

 season included in notes for each harbor.] 



1013. U. S. Engineer department. 



1935. The Ohio River. 5th ed. rev. to June 30, 1934. Washington. 



iii, 438 p. illus., map. 



1014. U. S. Engineer department. Rivers and harbors board. 



1936. Transportation lines on the Mississippi River system, 1936. 



Washington, D. C. vii, 124 p. plates, maps. (Transporta- 

 tion series no. 4.) 



1015. 'U. S. Weather bureau. 



Closing and opening dates of river navigation in the United 

 States due to ice. (Mss. from unpublished data in the 

 Weather bureau.) [Data for 16 places.] 



1016. *U. S. Weather bureau. 



1926. Summary of climatological data for Alaska, by sections. Sec- 



tion 2, The Interior valleys of Alaska. Bull. W. U.S.W.B. 

 Vol. III. [Tables: "Date ice broke in spring and river closed 

 in autumn", give data from 1882-1921 for various stations 

 on Iditarod, Koyukuk, Kuskokwim, Takotna, Tanana and 

 Yukon rivers. Some stations do not have data for all 

 above-mentioned years.] 



1017. Wentworth, C. K. 



1932. The geologic work of ice jams in subarctic rivers. Wash. 



Univ. studies sci. tech. n. s. 7:49-80. [Dates of opening 

 and closing of Yukon River, pp. 57-58.] 



1018. Wing, L. W. 



1943 . Freezing and thawing dates of lakes and rivers as phenological 



indicators. Mon. weather, rev. 71:149-157. 



SEE ALSO: 187, 188, 193, 202, 248, 632, 633, 680, 681, 695, 704-720, 962, 



