. Bulletin. .Sherfif, Earl E. (23) 1913. Vegetation of Skokie Marsh. Bui. State Lab. Nat. Hist. 9: , B. (24) 1911. The prairies. Bui. Lab. Nat. Hist., State Univ. Iowa, 6: No. , E. N. (25) 1903. On the geographical distribution and ecological rela- tions of the bog-plant societies of northern NorthAmerica. Hot. Gaz. 36: 401-420. (26) 1905. Forest centers of Eastern America. • Amer. Nat. 39: Arthur G. (27) 1913. An associational study of the Illinois sand prairies. Bui. 111. State Lab. Nat. Hist. 10: (28) 1914. A black-soil prairie station in north
. Bulletin. .Sherfif, Earl E. (23) 1913. Vegetation of Skokie Marsh. Bui. State Lab. Nat. Hist. 9: , B. (24) 1911. The prairies. Bui. Lab. Nat. Hist., State Univ. Iowa, 6: No. , E. N. (25) 1903. On the geographical distribution and ecological rela- tions of the bog-plant societies of northern NorthAmerica. Hot. Gaz. 36: 401-420. (26) 1905. Forest centers of Eastern America. • Amer. Nat. 39: Arthur G. (27) 1913. An associational study of the Illinois sand prairies. Bui. 111. State Lab. Nat. Hist. 10: (28) 1914. A black-soil prairie station in northeastern Tor. Bot. Club, 41: , Adolph E. (29) 1918. Crop centers of the United States. Jour. Amer. Soc. Agron. 10: 49-83. (30) 1918. The grasses. Correspondence Courses in Agriculture, Course VII, Lesson V. Extension Publications of theOhio State University. (31) 1921. The relation of plant successions to crop production. The Ohio University Publications, Vol. 25, No. 9. Plate XLVIII. Plate XLIX
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