References

References
HAMMERMAN, D.R. and HAMMERMAN, W.M.1968. Out- door education. Minneapolis, Minnesota: Burgess Publish- ing Company.
Hammerman
Outdoor education
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MILLEKIN, M., HAMER, A.F., and McDONALD, E.C.1968. Field study manual for outdoor learning. Minneapolis, Minnesota: Burgess Publishing Company.
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MOELLER, R.1973. Methods of prairie development used at the Aullwood Audubon Center, Dayton, Ohio. Ohio Jour- nal of Science73(5):307.
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NATIONAL AUDUBON SOCIETY. Audubon aids in natural science. New York: National Audubon Society Education- al Services.
National Audubon Society
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STROBBE, M.A.1972. Enuironmental science laboratory manual. St Louis, Missouri: C.V. Mosby Company.
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UNITED STATES DEPARTMENT OF AGRICULTURE. 1971. A selected bibliography of natural plant communities in eleven midwestern states. Soil Conservation Service Miscellaneous Publication No. 1205. Washington, D.C.: Government Printing Office.
—. 1972. Outdoor classrooms on school sites. Soil Con- servation Service PA-975. Washington, D.C.: Govern- ment Printing Office.
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