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21
Bethesda, MD : National Institute of Mental Health, 1964

Government Document Book
22
Edinboro, Pa. : Northwest Tri-County Intermediate Unit, 1992

Government Document Conference Proceeding Book
23
Harrisburg, Pa. : Office of the Cultural Advisor to the Governor, 1990

Government Document Book
24
[Harrisburg] : Commonwealth of Pennsylvania, Dept. of Public Instruction, 1920

Government Document Conference Proceeding
25
[New Oxford, Pa.] : The Unit, 1993

Government Document Book
26
Sault Ste. Marie, Ont. : Dept. of the Environment, Canadian Forestry Service, Great Lakes Forest Research Centre, 1982

Government Document Conference Proceeding Book
27
Philadelphia, Pa. : Philadelphia County Committee, 1960

Government Document Conference Proceeding Book
28

Government Document Conference Proceeding
29
Edinboro, Pa. : Northwest Tri-County Intermediate Unit #5, 1991

Government Document Conference Proceeding Book
30
[Washington, D.C.] : Public Health Services, Bureau of State Services, Division of Environmental Engineering and Food Protection, U.S. Department of Health, Education, and Welfare, 1963

Government Document Conference Proceeding Book
31
Washington, D.C. : U.S. Department of Labor, Children's Bureau : Government Printing Office, 1921

Government Document Conference Proceeding Book
32
Wilmington, Del. : Alfred I. Du Pont Institute, 1957

Government Document Conference Proceeding Book
33
[Washington, D.C.] : [National Science Foundation], 1972

Government Document Conference Proceeding Book
34
[Bethesda, Md.?] : U.S. Department of Health and Human Services, Public Health Service, National Institutes of Health, National Institute of Arthritis, Metabolism, and Digestive Diseases, 1980

Government Document Conference Proceeding Book
35
[Harrisburg, Pennsylvania] : [Governor's Committee for the Handicapped], 1963

Government Document Book
36
[Harrisburg, Pa.] : Pennsylvania Governor's Science Advisory Committee, 1975

Government Document Book
37
Upper Darby, Pa. : Northeastern Forest Experiment Station, 1971

Government Document Conference Proceeding Book
38
[Washington, D.C.] : US Department of State, 1976

Government Document Book
39
[Harrisburg, Pa.] : [Governor's Committee for the Handicapped], 1964

Government Document Conference Proceeding Book
40
[Harrisburg, Pa.] : [Pennsylvania Department of Education], 1992

Government Document