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1
by Bradt, R. C., Tressler, R. E.
Published 1975
Springer US
“... Materials, held at The Pennsylvania State University, University Park, Pennsylvania, July 17, 18, and 19...”
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2
by Bradt, R. C., Hasselman, D. P. H., Lange, F. F.
Published 1974
Springer US
“..., held at the Pennsylvania State University, University Park, Pennsylvania, July 11, 12, and 13, 1973...”