Books by Charles Helbing:
Books in the extended shelves:
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Helbing, Charles: Ten years of short-stay hospital utilization and costs under Medicare, 1967-1976 (Dept. of Health and Human Services, Health Care Financing Administration, Office of Research, Demonstrations, and Statistics, 1980), also by Demonstrations United States. Health Care Financing Administration. Office of Research (page images at HathiTrust)
Find more by Charles Helbing at your library, or elsewhere.