453. 
454. 
455. 
456. 
457. 
458. 
459. 
460. 
462. 
463. 
464. 
465. 
habits near Hays, Kansas. Trans. Kans. Acad. Sci. 
67: 41-49. 
Pepoon, H.S. 1910. The forest associations of 
northwestern [linois. Trans. Ill. Acad. Sci. 3: 
143-156. 
Phillips, Alice. 1929. Life forms and biological 
spectra of the flora of Bacon Swamp, Indiana. 
Butler Univ. Bot. Studies 1: 41-54. 
Poggi, E. M. 1934. The prairie province of Illinois. 
Univ. Ill. Studies in Social Sci. 19: 1-124. 
Pokara, Dan. 1968. Seasonal changes in a sand 
prairie in Van Buren County, Michigan. Mich. Bot. 
7: 62-66. 
Pool, R. J. 1914. A study of the vegetation of the 
sandhills of Nebraska. Minn. Bot. Studies 4: 
189-312. 
J. E. Weaver, and F.C. Jean. 
1918. Further studies in the ecotone between 
prairie and woodland. Univ. Nebr. Studies 18: 
1-47. 
Potter, Loren D., and Duane L. Green. 1964a. 
Ecology of ponderosa pine in westem North 
Dakota. Ecology 45: 10-23. 
eee and Duane mie. Green. 1964b:; 
Ecology of a northeastern outlying stand of Pinus 
flexillis.Ecol. Monographs 45: 866-868. 
—______ and D. Ross Moir. 1961. Phyto- 
sociological study of bummed deciduous woods, 
Turtle Mountains, North Dakota. Ecology 42: 
468-480. 
Potzger, J. E. 1934. A notable case of bog forma- 
tion. Amer. Midl. Nat. 15: 567-580. 
ee 19360") Post-Pleistocene fossil 
records in peat of the Upper Blue River Valley, 
Henry County, Indiana. Proc. Ind. Acad. Sci. 45: 
64-68. 
1936b. Topography and forest 
types in a central Indiana region. Amer. Midl. Nat. 
16: 212-229. 
1939. Microclimate and a 
19 
466. 
467. 
468. 
469. 
470. 
471. 
472. 
473. 
474, 
475. 
476. 
477. 
notable case of its influence on a ridge in central 
Indiana. Ecology 20: 29-37. 
ee ee 1941.) The. vegetation ofthe 
Mackinac Island, Michigan: An ecological survey. 
Amer. Midl. Nat. 25: 298-323. 
eS 1942; Pollen spectra from four 
bogs on the Gillen Nature Reserve along the 
Michigan-Wisconsin state line. Amer. Midl. Nat. 
28: 501-511. 
1943. Pollen study of five bogs 
in Price and Sawyer Counties, Wisconsin. Butler 
Univ. Bot. Studies 61: 54-64. 
1946. Phytosociology of the 
primeval forest in central-northem Wisconsin and 
Upper Michigan, and a brief post-glacial history of 
the lake forest formation. Ecol. Monographs 16: 
211-250. 
1948. A pollen study in the 
tension zone of Lower Michigan. Butler Univ. Bot. 
Studies 8: 161-177. 
1950. Forest types in the 
Versailles State Park area, Indiana, Amer. Midl. 
Nat. 43: 729-742. 
1953. History of forests in the 
Quetico-Superior country from fossil pollen 
studies. J. Forestry 51: 560-565. 
—_—____- 1956. Pollen profiles as indi- 
cators in the history of lake filling and bog forma- 
tion. Ecology 37: 476-483. 
a wee) and i ‘Chandler. 1950. Beech 
in the forests about Laughery Creek Valley. Proc. 
Ind. Acad. Sci. 59: 82-94. 
eee ae and  Chandler21953) ‘Oak 
forests in the Laughery Creek Valley, Indiana. 
Proc. Ind. Acad. Sci. 62: 129-135. 
se ee and, As Courtemanches 1955: 
Pollen profiles as indicators in the history of lake 
filling and bog formation. Ecology 37: 476-483. 
and R.C. Friesner. 1934. Some 
comparisons between virgin forest and adjacent 
areas of secondary succession. Butler Univ. Bot. 
Studies 3: 85-98. 
